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Online since: January 2019
Authors: Werner Lerch, Richard Heimrath, Thomas Mach, Andreas Heinz, Christian Fink, Thomas Ramschak
For the thermal building and system simulations an average climatic data set (over 10 years) is used (Tambient,average: 10.7 °C, heating degree days: 3102 Kd, global hor. radiation: 1206 kWh/m²a, diffuse hor. radiation: 616 kWh/m²a) [6].
The evaluation of the simulation data revealed that an efficient option is to use the surface temperature of the heat transfer surface (TABS or Floor) as the control variable.
For the LEB, this means a reduction of the total electricity consumption from 1458 kWh/a (9, System B) to 1100 kWh/a (11, System C) in case of the TABS system.
In the case of the LEB with TABS and System C compared to the underfloor heating system without solar direct charging (System B), this means a reduction of approx. 25 % of the total electricity consumption (approx. 400 kWh/a).
[6] Meteotest, Meteonorm 7.1.11.24422, Global Meteorological Database for Engineers, Planner and Educations, Software and Data on CD-Rom, Bern, Switzerland, 2015
Online since: August 2011
Authors: Qun Wang, Lu Qi
For each film, five specimens were tested and the average value of them was taken as the resultant data.
All the above measurements were repeated there times and the average value was taken as the resultant data.
That was to say, with the increase of GE of FP, the macromolecular chain of PVA become more irregular because of the more and more graft chains, which might create more defections in the crystallization structure and finally result in further reduction of the tensile strength of the film.
The reason of the reduction of the elongation at break might also due to the graft of FP.
Because the data of the WA were obtained after putting the film into the water for 24h, the process of the water-absorbing was considered as a gradually swollen process accompanying a process of dissolving, which finally reached equilibrium in 24h.
Online since: July 2021
Authors: Cesare Signorini
Again, to simulate the effects due to the sharp reduction of the pH in the external portion of concrete elements as a consequence of the carbonation phenomena, a 1M aqueous solution of hydrochloric acid is also realised, according to the procedure suggested by Kajorncheappunngam et al. [25] for fibre-reinforced plastic.
Indeed, the dissipation capability simultaneously cross-checks strength and ductility data [30].
However, such modest improvement presents a very limited statistical robustness, since data scattering also grows, thus reducing the design values, accordingly.
Finally, data scattering is consistent with other durability tests for brittle construction materials, being the coefficient of variance in the ultimate strength and strain lower than 20% [32].
The strength threshold is never breached, and the ductility reduction is compensated by a slight strength gain, so that the overall dissipative attitude of the composite is preserved.
Online since: September 2005
Authors: M.D. Obradović, B.N. Grgur, Lj.M. Vračar
In literature, a few data are available concerning the study of nickel upd.
The obtained results are in agreement with the literature data [16] that nickel adsorption requires two platinum atoms for upd on polycrystalline platinum surfaces.
It should be noticed that oxygen reduction peak is shifted to a lower potential, as the oxygen adsorption currents are lower. 0.0 0.5 1.0 1.5 -200 0 d) pH = 7.0 E vs.
These results show that nickel upd followed by adsorption of hydrogen starts after reduction of oxygen species from the platinum surface.
-40 -20 0 20 0.0 0.1 0.2 0.3 0.4 5 10 15 20 a) T / K 274 283 288 293 303 313 Φ (Ni) / kJ mol -1 b) Φ (H) / kJ mol -1 θ (i) Fig. 3 Variation of Φ with surface coverage for: nickel upd (a) and hydrogen upd (b), as a function of temperature (according to Eq. 6 and data from Fig. 2 b) and c)).
Online since: August 2010
Authors: Chuan Zhen Huang, Jun Wang, Hong Tao Zhu, Zeng Wen Liu, Quan Lai Li
Therefore, a relatively small reduction of r will cause a significant increase of the mass of particles and the reduction of cutting width is negligible by contrast with the cutting depth.
Model assessment In order to determine the constants in the model, a regression analysis of the experimental data obtained in this study has been performed.
Consequently, the model of aspect ratio can give adequate predictions both qualitatively and quantitatively, and can be used for predicting and controlling of the aspect ratio in process planning. 0.3 0.45 0.6 0.750.4 0.6 0.8 Air pressure (MPa) Aspect ratio Experimental Predicted u =0.1mm /s α =90° m a =0.0025g /s 0 0.05 0.1 0.15 0.2 0.0025 0.0058 0.0092 Abrasive flow rate (g /s) Aspect ratio Experimental Predicted P=0.6MPa u =0.3mm /s α =30° 0 0.2 0.4 0.6 0.8 0.10 0.17 0.23 0.30 Nozzle traverse speed (mm /s) Aspect ratio Experimental Predicted P=0.6MPa α =90° m a =0.0025g /s 0.03 0.08 0.13 0.18 0.23 30 60 90 Jet incidence angle ( ° ) Aspect ratio Experimental Predicted P=0.6MPa m a =0.0025g /s u =0.3mm /s Fig. 2 Comparisons between model predictions and experimental data Summary An experimental investigation of the aspect ratio in MAAJ cutting of monocrystalline silicon has been carried out and reported.
The results of this paper may be meaningful to predict and control the aspect ratio more efficiently. 0 10 20 30 40 50 -30 -15 0 15 30 45 Percentage deviation (%) Frequency (%) Mean=1.32% Fig. 3 Percentage deviations of the model predictions from the experimental data Acknowledgements This project is supported by Outstanding Young Scholar Science Foundation of NSFC-International Collaborative Research Foundation (No.50328505), Australia Research Council Discovery Foundation(DP0342641)and Ph.D.
Online since: August 2022
Authors: Muhamad Faiz Md Din, Fakhroul Ridzuan Hashim, Nur Syafira Mohd Abdul Rahman, Nurul Fatehah binti Roslan, Mohd Taufiq Ishak
The reduction of BDV is ranging from 5 % to 43 %.
The detailed data can be referred to in Table 2.
The cumulative Weibull distribution function is given in equation (1) where t is the measured data, α is the scale parameter and β is the shape parameter.
These figures predict higher breakdown voltage at low failures rate (<10%) than experiment data.
The presence of PVP does not have a significant increment of AC breakdown voltage and could cause a reduction in the AC breakdown voltages at a specific concentration of CNT and even degrade the nanofluid performance.
Online since: October 2015
Authors: Róbert Štefko, Sebastian Kot, Przemysław Dragon
One should not however forget also about existing barriers in the learning organization, among which it is certainly possible to rank: ü authority traps – solving problems in routine way, ü subjective drawing conclusion from own experiences, ü defensive thinking – fear of transpiring that former actions were wrong, ü fear of experimentation, ü lack of time for collecting data and learning on the base of them.
Table.2 Reasons of delay Reason for delays % Invalid evaluation of basic range of the project 29% Problems with the organization of tasks 20% Insufficient availability of key users of the project 17% Data quality 17% Software functionality 4% Source: Authors’ elaboration According to analysts companies deciding to implement the ERP class software are directed above all by desire for implementing improvements, which will be translated into reduction of operating costs or increase of turnovers the company.
However only 7 per cent observes reduction of labor costs.
Although that authors for the purposes of the present article quote only some data from examinations conducted by Panorama Consulting it is hard not to think that problems with the effectiveness of the implementation of systems of the ERP class are in the straight majority connected with improper functioning of the organization, in which that solution is being implemented.
Online since: March 2015
Authors: Magdalena Popczyk, Magdalena Szklarska, Agnieszka Smołka, B. Łosiewicz, Patrycja Osak, A. Budniok
Data collected from the Science Direct.
The LEIS spectra obtained for the Al-Cu alloy part in Fig. 3b show that in the case of the position being close to the interface (x = +1), a capacitive behavior is visible with two time constants in the circuit which can be related to charge transfer during the oxygen reduction reaction and semi-infinite diffusion.
The large capacitive loop registered at low-frequency part was associated with the charge transfer process of the oxygen reduction taking place on the surface of the steel.
The result is an instrument that offers the user the ability to obtain spatially resolved EIS data by the use of a scanning probe, rather than the surface-averaged results obtainable with traditional EIS techniques.
From the review of the newest literature data it results that the LEIS technique is able to provide valuable information relating to local surface effects such as pores in coatings, chemical heterogeneities and under film corrosion.
Online since: November 2012
Authors: Fang Yan
An analysis should substantiate the degree of dissimilarity and independence of: implementation, requirements, algorithms, data, environment, and other potential sources of design error.
A large amount of civil aviation data of different electronic systems has been collected to support table 2.
These system architectures may reduce the complexity of the various items and their interfaces and thereby allow simplification or reduction of the necessary assurance activity9.
The contribution of complexity reduction (i.e. the contribution of common error limitation) depends on the independence of the system architectures, including both function independence and item development independence.
Due to the aircraft design access difficulty, the paper studied limited architectures, the further study could be focused on studying more types of architectures, and on in-service data collection to verify the safety abjectives achieved by assigned level.
Online since: October 2010
Authors: Wei Gang Zhang, Shu Hui Li, Zhi Gang Wu
Introduction Recently, tube hydroforming method has been utilized to replace traditional method to manufacture automobile components owing to its advantages, such as weight reduction, safety improvement, cost reduction and dimension accuracy[1].
To conclude, the presented simulation predictions are in fair agreement with the experimental data.
According to the data in Table 3, the regression coefficients can be calculated, and the following equations are obtained: 0.4431 0.0798 0.0085 0.0941 0.0717 1 2 3 4 a / t = + x x + x x − − , (6) 0.3028 0.2555 0.0146 0.0223 0.0231 1 2 3 4 b / t = x + x + x + x − , (7) 0.0791 0.2028 0.0128 0.0126 0.0377 1 2 3 4 Y = x + x x + x − −
From the data above, it is concluded that these three first-order regression models are acceptable.
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