Search Options

Sort by:

Sort search results by

Publication Type:

Publication Type filter

Open access:

Publication Date:

Periodicals:

Periodicals filter

Search results

Online since: February 2003
Authors: Sergey I. Sidorenko, Yu.N. Makogon, E.P. Pavlova, A. Csik, T.I. Verbitskaya, Yu.V. Nesterenko, King-Ning Tu
After annealing at 970K for 1 hour, the X-ray diffraction data indicated the formation of Ti5Si3 alongside with NiSi and Ni3Ti (see Fig. 2a).
From data of X-ray diffraction, we found that the annealing at 870K for 8 hours did not cause essential changes of their phase structure.
Results of resistivity measurement have confirmed the phase changes discussed in the above (Fig. 3). 0 2 4 6 8 10 12 14 16 18 20 270K 670K,1h 870K,1h 1070K,1h 1070K,2h 1270K,1h Annealing Specific resistance, µµµµΩΩΩΩ-cm Fig. 3 Change of electrical resistivity of 200 nm Ti/200 nm Ni/(001)Si after annealing After annealing at 870K the samples showed a sharp reduction of electrical resistance, which can be explained by the formation of NiSi.
These data testify that the thermal stability of NiSi phase formed in the ternary system of Ti/Ni/Si as studied here, is better than the NiSi formed in the binary system of Ni/Si.
Online since: January 2013
Authors: Guo Fu Sun, Yong Mei Li, Bing Zhou, Bo Yan Yang
It is generally believed that the structural damage shows the reduction of the local stiffness, thus resulting in the changes of structural modal parameters.
Based on the features of spatial structures with a long span, combine the characteristics of modal strain energy and the unique capability of the data processing of wavelet transformation, and make research on damage location of spatial reticulated shell structures.
Structural damage can be detected through the details mutation after the wavelet transformation to the corresponding data.
The numerical simulation of a K8 single-layer reticulated shell shows that it can be used for damage identification to spatial structures by the combination of characteristics of modal strain energy and the unique capability of wavelet analysis in processing data.
Online since: December 2012
Authors: Zhi Gang Zhu, Jiang Biao Wu, Shuang Zhang
And the frequency band occupied by these pulses is up to several GHz, and the data transmitted rate of UWB communication system can be from several Mega to Giga bits every seconds.
So the transmitted signal shape of UWB communication system can be denoted as (2) Where and denote data notations which is binary independent identity distribution statistic variable, and the time shift caused by one data notation is denoted by Δ.
Blind source separation technique for reduction of co-channel interference.
Online since: November 2013
Authors: Pavlo V. Kryvenko, Vít Petranek, Sergii Guzii, Konstantinos Sotiriadis, Anastasiia Kravchenko
The identification of the crystalline phases detected by the XRD analysis was carried out using data obtained from the Joint Committee of Powder Diffraction Standards (JCPDS data base).
The analysis of the calculated data (Fig. 4) shows that an increase of the swelling coefficient and thermal conductivity coefficient from 2.5 to 15 and from 0.03 to 0.3 W∙m-1∙K-1, respectively, result in an increase of the thickness by 6 times.
Furthermore, a decrease of the volumetric specific thermal capacity at constant pressure from 3∙105 to 3∙106 J∙m-3∙K-1 results in a reduction of the thickness of the geocement-based material by 10%.
Online since: September 2018
Authors: Cristiane Fonseca de Carvalho, Ana Carolina Motta Maffra, Bernardo Tomas José Dias de Sousa, Cláudio Luis de Melo-Silva, Guilherme Ribeiro Baumgardt, Jefferson Fabricio Cardoso Lins, Tereza Cristina Favieri de Melo-Silva
Results The data obtained from each experimental group were submitted to statistical analysis using one-way ANOVA and Tukey’s test, with a significance level of 5%.
To obtain the data, the author used a rugosimeter with cut-off of 0.8, reading length of 2.0 mm and velocity of 0.3 mm/min, obtaining values of 0.06 ± 0.01 μm for the control group and 1.22 ± 0.07 μm for the etched group with 10% HF [4].
This is due to an increase in the surface area, high free surface energy of the ceramic and reduction of the angle of contact between solid and liquid, which favours the penetration of the liquid, increasing adhesion [5,10].
Conclusion Based on the data obtained from this study, it can be concluded that the surface etching time of the lithium disilicate was sufficient to generate surface irregularities that favoured the increase of the bond strength.
Online since: May 2011
Authors: Liu Yang, Xin Rong Zhu, Jia Ping Liu
Fig.1 Geographical location of Xi'an Fig. 2 Typical building model of this research Table 1 contains outdoor meteorological data in the summer of Xi'an [6].
Table 1 Summer meteorological data of city Xi'an Time Daily-average temperature [℃] Average daily temperature swing [℃] Daily-average Humidity[g/㎏] June 24.73 15.7 12.56 July 26.68 13.2 16.64 August 26.61 13.8 15.26 Modeling the typical building According to investigation on office building in Xi'an, typical office building model had been built.
For the building in this research, cooling load reduction by night-time ventilation can achieve reach 30%, compared with the air-tight air-conditioned buildings.
[6] China Meteorological Administration: Weather data for building thermal environment analysis of China (China Building Industry Press, Beijing 2005) (In Chinese).
Online since: May 2003
Authors: Toshiyuki Hashida, Takamasa Onoki, Kazuyuki Hosoi
The displacement data were used to determine the volume ratio V of the sample, defined as follows: 100× ∆− = i i h hh V
The temperature and pressure histories are shown in the figure along with the volume ratio data.
The toughness data plotted in the figure are average values obtained from at least five specimens.
As shown in Fig. 6, the prolonged treatment of 24hrs provide no further increase in the interface toughness and rather cause a toughness reduction for Ti-15Mo-5Zr-3Al alloy in contrast with Ti-6Al-2Nb-1Ta.
Online since: March 2004
Authors: Tae Hyun Nam, Ji Soon Kim, Seung Baik Kang, Kang Sup Yoon
Single and double-ring type bone fasteners were developed based on analysis of the computerized tomography (CT) transverse section data of human bones.
The safety and effectiveness of this bone fastener system were evaluated by analysis of follow-up data.
The reduction in temperature initiated a conversion into a martensitic phase state.
There is currently no published data demonstrating that the use of this TiNi SMA in the human body has any negative effect, and several medical devices used as permanent implant have been approved for their safety and efficacy and now on the market.
Online since: June 2014
Authors: Hong Wei Yan, Yong Li Zhu, Guo Chen Fan, Xi Xiong
It is quite sensitive, but the data window is too long to the traveling wave protection. [5] just analyzes the induced lightning regardless of the direct lightning. [6] takes advantages of the changing trends of zero-mode fault voltage in a period of time to identify shielding and back striking lightning.
From analyses of the waveform above, it can be seen that the lightning current waveform is shaking because of the constant reduction of the catadioptric lightning current and the little damped coefficient of the transmission line system.
TABLE.1 CHARACTERISTICS IN TRANSMISSION LINE DISTURBANCES Type of faults I1[kA×ms] I2[kA×ms] S Single-phase ground 179.64 0.0011 127.03 Two-phase fault 509.02 0.0011 113.82 Two-phase ground 421.99 0.0011 298.34 Three-phase fault 271.65 0.0011 192.09 Lightning fault 391.15 51.02 240.51 Lightning interference 86.94 98.03 7.84 Data in the table above apply that identification value of lightning interference is much less than that of faults.The biggest S in the interference is 7.84, while the smallest that of faults is 113.82.
TABLE.2 FEATURES OF LIGHTNING FAULTS Type Waveform[us] Current[kA] EDJ[106A2] EAJ[106A2] K shielding 2.6/50 30 423.52 197.95 2.14 60 2003.4 203.94 9.82 10/350 30 402.07 178.79 2.25 60 1892.4 238.89 7.92 back striking 2.6/50 120 60.71 194.22 0.31 150 190.43 225.59 0.84 10/350 12 45.57 199.99 0.23 150 89.56 217.12 0.41 TABLE.3 FEATURES OF SHORT-CIRCUIT FAULTS Type Transition resistance[Ω] EDJ[106A2] EAJ[106A2] K Single-phase ground 10 0.065 58.95 0.0011 500 0.0084 3.21 0.0026 Two-phase short circuit 10 5.05 425.61 0.012 500 0.43 51.96 0.0084 Two-phase ground 10 3.95 303.03 0.013 500 0.11 13.91 0.0082 Three phase short circuit 10 0.42 137.34 0.0030 500 0.018 7.27 0.0025 According to the data above, K in the shielding lightning fault is higher than that in the back striking lightning fault.
Online since: January 2015
Authors: M.A. Vysotskaya, Svetlana Rusina
On the basis of literary data it is known that one of the most perspective techniques of improvement of quality of composite materials is their modification at nanodimensional level, and the most actual method of increase of corrosion resistance is use of the modified bitumens or mineral powders.
Basic data for calculation of the generalized criterion of quality Indicator name Requirements GOST Ratio nanomodified agent and traditional mineral filler, [%] 100 80/20 70/30 60/40 50/50 40/60 30/70 conditional numbers of compositions 1 2 3 4 5 6 7 The limit of compressive strength , [МPа], 0 °С no more than 12 6.8 6.8 6.9 7.0 7.0 7.5 8.1 20 °С at least2.2 6.1 5.7 5.7 5.0 4.9 4.9 4.8 50 °С at least1.0 4.2 4.0 3.5 3.5 3.35 2.7 2.4 water saturation , [%] 1.5-4.0 0.90 0.94 1.03 1.20 1.30 1.34 2.05 swelling, [%] no more than 1 0.01 0.01 0.01 0.01 0.03 0.05 0.09 Long resistance at least 0.75 1.15 1.10 1.10 1.03 1.01 0.91 0.87 It is obvious that the nanostructured agent has considerable impact on strength characteristics of asphalt concrete in the wide range of temperatures.
The generalized criterion of quality According to fig. 4 reduction of the maintenance of the nanomodified filler as a part of asphalt concrete promotes decrease in the generalized criterion of quality.
Finale According to the obtained data, it is possible to conclude that the developed nanomodified filler on the basis of a tufa containing zeolite and asphalt concrete on its basis possess high rates of properties in comparison with structures on traditional mineral powder.
Showing 25591 to 25600 of 40412 items