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Online since: January 2005
Authors: X. Zhang, Fan Hao Zeng
Recently a new method, hydrogen reduction indium-oxide powder with silver nanoparticles as catalyst, was introduced [13] to fabricate In2O3 nanowires.
The XRD data were collected in the 2θ range from 25° to 60° with a scanning rate of 4.0° per minute.
The values are approximately in agreement with reported data (JCPDS card: 76-0152) (Some peaks may be overlapping by the background of substrate).
Online since: September 2011
Authors: Rachanusorn Roongtao, Wanwilai C. Vittayakorn, Supagorn Rugmai
By comparison with BaTiO3 data in the JCPDS file number 75-0210, all peaks can be indexed for cubic structure which confirm by nonsplitting of the (002) and (200) peaks at 2θ ~ 45° [3] and the lattice constant calculated from the XRD data is a = 3.995 Å.
Discontinuous grain growth was found, leading to the reduction of density and the increase in intragrain porosity [12].
Online since: September 2011
Authors: Hao Jie Lv, Guo Qing Hu, Xing Ye Wang
Due to the much stronger reduction of phonon mean free path, the TC of film will be significantly reduced than pure bulk samples.
For the heavily doped silicon diaphragm with 4μm thickness and 1.0×1020/cm3 boron doped concentration, The TC as a function of temperature has been described accurately after synthesizing a set of equilibrium equations [7] and referring to the research data of M.
Wolf: Silicon semiconductor data (Pergamon Press., England 1969)
Online since: December 2013
Authors: Xiao Hong Liu, You Tong Zhang
So if we decrease the engine speed ripple through engine torque ripple reduction, the fuel economy and smoothness of vehicle will achieve.
compensating torque response rate is: (8) From Eq. 8, to diminish the first harmonic wave in engine torque ripple, the response character of driving motor torque is that the peak motor torque Tmax(n) must be larger than the first harmonic wave peak valueT1, and the torque response rate r must be larger the maximum change rate of compensatory torque, that is: (9) For the parallel HEV described above, the motor is working in a constant torque area when the engine is during idle, and at this time, the motor output maximum torque, Eq. 9 can described as: (10) If the first and second harmonic waves in engine torque ripple is required to diminish, and the motor torque character must be met with Eq. 11; according to this method, we can diminish the more order harmonic wave: (11) Extracting data
from fig.1 and substitute the data to Eq. 1, change the equation with Fourier transformation, that is: (12) To realize the first torque ripple cancellation, the torque character of the driving motor must meet up with Eq. 13 (13) To cancel the first and second torque harmonic wave, from Eq. 6 and Eq. 13, the torque response time tr is about 9.2ms.
Online since: September 2014
Authors: Miao Miao Zan, Tie Jun Qu
At present, our country has already built or under construction of nuclear power plants and coal-fired power plants steam turbine generator foundation adopt spring vibration isolation foundation.It usually use the vibration isolation efficiency to measure the effect of spring vibration isolation foundation.The main disturbance force is the centrifugal force of rotating objects during operation which can be approximated into harmonic force.The vibration isolation efficiency is obtained under the deterministic harmonic forced vibration.It reflects the reduced degree of dynamic load equipment’s structural vibration.The degree of reduction can be measured by different indicators,such as attenuation speed, acceleration, displacement, and force.In this paper,it is measured by force.
Acceleration transducers were arranged in A and B respectively(see Figure 4).Measured A and B’s accelerations, in the same disturbance force and different frequencies.The displacements of A and B were obtained by data acquisition system.So: Figure 4 Diagram of the test position (4) (5) (6) In the equation,andare the displacements of A and B;is the NO.i spring vibration isolator's stiffness;is the force NO.i spring vibration isolator transfer to the column; are the sum of the forces transfered to the columns. 3.3 Test Equipments Table 2 are the equipments ( hardware and software) and their performance indexes.
Table 2 Test Equipments Equipments Model Range Frequency range The sensitivity Acceleration sensor 356A16 ±50g 0.5-5kHz 100mV/g Vibration exciter JZ-50 500N 5-3000Hz 3mm Power amplifier GF500W 500W —— —— Dynamic signal analyzer SCADASIII —— —— —— Data acquisition system LMS Test 9A —— —— —— 3.4 The Test Results and Analysis The transfer coefficients under different frequencies were obtained by test(see table 3),and a transmissibility and frequency curve was given(see figure 5).
Online since: October 2010
Authors: Xiu Min Yang, Lei Zhang, Tao Wei, Ying Di Shi
The Structure and Transmission Theory of GL160C CVT Fig. 1 shows the structure of GL160C CVT, the engine power is transmitted to the driving pulley, metal belt and driven pulley by the Planetary mechanism, the forward and reverse clutch, then transmitted to final reduction gear, differential mechanism, half axle by the intermediate shaft, and finally to the driving pulley.
Fit the data from the experiment, then compare it with the ideal data of the engine bench test, the result is shown as Fig.2 and Fig.3.
Online since: April 2014
Authors: Xiao Li Peng, Wen Bin Guo, Jian Fei Zhang, Shu Zhang, Yong Xiang
Several intense peaks at 2θ = 26.6°, 44.2°, 52.4°, 64.3° and 70.9° are identified as the CuInSe2 crystal planes of (112), (204)/(220), (116/312), (400) and (332) respectively, consistent with the reported CIS data (JCPDS NO. 80-2189).The synthesized CIS materials are confirmed by Raman spectra (Fig.1 d-f),in which the most intense peak at 174 cm-1(Fig. 1d), 172 cm-1 (Fig.1e) and 183 cm-1 (Fig.1f) can all be assigned to the A1 mode of the chalcopyrite CuInSe2 phase [5,6,7].However, when the reaction time of 3 h was carried out, peaks at2θ= 25.3° and 44.9°(Fig 1a) andRaman peak at 258 cm-1 (Fig. 1d)that can both be assigned to Cu2Se (JCPDS NO.02-1275) [6], an intermediate for the formation of CIS [8].
The growth mechanism for CIS is generally presented with the following Eq.1-4 [4]: 2InCl3+ 3Se2-→In2Se3+ 6Clˉ (1) In2Se3+ Se2-→ 2(InSe2)ˉ (2) Cu++ 2en → [Cu(en)2]+ (3) (InSe2)ˉ+ [Cu(en)2]+→ CuInSe2+ 2en (4) In this mechanisms,en ligandscan chelateCu+ ions (through reduction of Cu2+) and form [Cu(en)2]+ firstly, but not react with Se2- (In the solvothermalprocess, a nucleophilic attack by amine can activate elemental selenium to form Se2- [4]) to produce Cu-Se compounds, and there are no Cu-Se formation.
However, based on the results in our study, Cu2Se phase appears along with the formation of CIS which is identified by X-ray diffraction data and Raman spectra of CIS synthesized with reaction time of 3 h and 24 h.
Online since: May 2014
Authors: Pongjet Promvonge, Witoon Chingtuaythong, Narin Koolnapadol, Sutapat Kwankaomeng
All of the temperatures getting from the system were consistently recorded using a data logger.
Data Reduction The Reynolds number (Re) based on tube diameter is given by (1) The friction factor (f) computed by pressure drop across the test section length (L) is (2) In the experiment, the steady state of the convective heat transfer rate is assumed to be equal to the heat loss from the test section.
Online since: November 2014
Authors: Januar Parlaungan Siregar, Tezara Cionita, Juliawati Alias, Yuli Panca Asmara
Hydrogen gas can be produced by the dissolution of atomic hydrogen in the steel as a result of reduction of water molecules by cathodic overprotection.
Table 3 shows experimental data effects of CO2 gas and H2 gas on corrosion rate and corrosion potential (Ecorr).
Comparing data before and after injecting current, it indicates that corrosion potential will decrease as an effect of H2 gas production.
Online since: October 2014
Authors: An Wang, Wei Dong Xu, Zhen Jian Lv, Heng Liu, Jian Hua Wu
target and background contrast : contrast before the interference : comparision and interference coefficient : thickness of the optical interference (2) (3) : energy of interference sources :number of interfence sources :wind speed :smoke diffusion radius :camouflage ability Considering optical interference, visibility interference coefficient was used in the visibility expression (4) (5) (6) In equation(5), m is lens transmittance, it’s between 0.5-0.7; n is neutral transmittance attenuation, It’s set according to the outside world illumination and camera tube standard degree of target surface, it’s 0, 0.2, 0.5, 0.8; is background reflection coefficient, the data
Using the seeker data given in reference [6] and enter related numerical value of multiband smokescreen, curve showed how TV guidance seeker range changed with contrast was shown in figure 4.
As smoke functions, the contrast of target and background will decrease; resulting in a reduction to about 0.2, and distance close to 300m.
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