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Online since: November 2015
Authors: Constantin Pana, Niculae Negurescu, Alexandru Cernat
The Liquid Petroleum Gas can be use for diesel engine fuelling with significant result in term of pollutant emissions improvement, with important reduction of nitrous oxides and smoke for a LPG dual fuelled diesel engine.
Thus, based on the experimental data, an evaluation model for mixture forming was developed for an automotive diesel engine fuelled with LPG and diesel fuel by diesel-gas method.
(4) where: minj is in-cylinder injected fuel mass, m in-cylinder injected fuel mass and unformed as mixture, p oxygen partial pressure, C model calibration parameter with experimental data.
The ws values registered for dual fuelling are all superior to diesel fuelling values, the increase being correlated with the previous observed reduction tendency for vaporization and combustion times.
The reduction is up till 4% for the xc percent that registered also the most reduced vaporization time, Fig. 1.a.
Online since: June 2017
Authors: Chang Lv
For the steering drive axle of the QAY125 all terrain crane, the main parameters of the main reduction gears and drive axle housing have been designed and calculated.
Data in Table 1 formula I= 5.611 can be obtained.
For the single main reduction gear, when i0 is larger, trying to make the driving gear teeth smaller values, in order to get satisfied driving axle of clearance from the ground.
This topic main reduction gear ratio is 5.611, between 5-8, combined with Gleason recommended shown in Table 2, preliminary selected Z1 is 6, Z2 is 41.
Therefore, in this paper, calculate the driving axle of the main reduction and main parameters of axle housing of the QAY125 all terrain crane.
Online since: September 2011
Authors: Zhi Tao Wang, Jie Tian, Xiao Dong Guo, Dong Hui Ma, Wei Wang
Processing To standardize the original data, we may get standardization of indicators according to the value of fuzzy membership function.
To further eliminate the correlation between the data, according to the principles of multivariate statistical analysis, the data may be transformed as (3) where is an n-dimensional random vector, whose matrix may be expressed . cov() is the covariance matrix of .
Table 2 Fractal dimensions of different urban disaster-carrying capabilities Note: "-" indicates no value; primary data sources may refer to literature [11].
Conclusions (1)The data distribution of statistical indicators data distribution of urban comprehensive disaster-carrying capability has obvious fractal characteristics.
But this model is only preliminary, there is imperfection of data sources, data selection, evaluation indicators established, it may not reflect the overall level of the various regions fully.
Online since: February 2019
Authors: Stepan I. Stepanov, Anatoliy G. Illarionov, Yu.N. Loginov
Coefficient for evaluation the ultimate tensile strength from the micro-indentation data was determined.
The formula was proposed for estimation the dislocation density the stress strain curves and from the data on the grain size in the transverse section of the wire.
The data on the mechanical properties for the wire of various diameters are summarized in Table 1.
Based on the literature data [16] we estimated the grain-boundary strengthening by the Hall-Petch equation (2): σgb = σo+ Kdd, MPa
The method of estimating the density of dislocations using the data from stress-strain diagrams and the grain size value of the electrical copper wire in the transverse section was proposed, which allowed for calculating the data comparable ​​with previous studies.
Online since: July 2014
Authors: Naresh Kumar Gurusala, Richu Zachariah, V. Arul Mozhi Selvan
Computer 5.Data Capture Card 6.
All the sensors are connected to Data Acquisition System which will store the data in to the computer.
There is a reduction in peak heat release rate for EGR operation as shown in Figure 4.
This is due to the reduction in oxygen concentration by the replacement of CO2.
Around 25% reduction in NO emission was observed for B20 fuel blend with 30% EGR when compared to the emission without EGR.
Online since: February 2011
Authors: Yong Hua Li, Tao Fan, Ning Zhang
The build-up phenomenon and its influencing factors like principal axis speed, axial feed rate and wall thichness reduction were investigated using the finite element method (FEM).
But the determination of technical parameters of backward ball spinning depends chiefly on technician’s experience and lots of trial and error because there is no adequate available data.
Proper selection of technical parameters like principal axis speed, axial feed rate and wall thickness reduction is vital to manufacture the spun tube product with desired surface quality and dimension precision.
Fig.4 simulated result of the build-up phenomenon of ball spinning of tube t0 t Fig.5 Simulated result of the steady state of ball spinning of tube Fig. 6 Influence of axial feed rate on build-up factor Fig. 7 Influence of wall thickness reduction on build-up factor As shown in Figs.6 and 7, the build-up factor would increase remarkably with the increase of axial feed rate or wall thickness reduction.
Taking the product quality and manufacturing efficiency into account, the proper axial feed rate and wall thickness reduction were in the ranges of 0.5 to 0.8 mm /r and 25 to 30%, respectively.
Online since: August 2013
Authors: Yong Luo, Chao Liu
According to the census data of heat hazard in Chinese coalmines, there were heat hazards in 65 operation mines at different degree, and workface temperature in 38 mines reached over 30 oC and the geothermal temperature gradient is 2~4oC/100m.
Temperature reduction in Guqiao mine.
The variation curves of dry bulb temperature and humidity ratio of temperature reduction in working face are as shown in figure 3 and figure 4.
Fig.2 Variation curves of air temperature in air-roadways for faces 1115(1) and 1117(1) Fig.1 Variation curves of air intake in faces 1115(1) and 1117(1) Fig.3 Variation curves of dry bulb temperature in face 1141 (3)before and after temperature reduction Fig.4 Variation curves of humidity in face 1141 (3)before and after temperature reduction Analysis of results of temperature reduction.U ventilation system are used in most mining faces in Chinese coal mines (Figure 3).
The technology supplies a new method for temperature reduction in coal mines, and realizes comprehensive utilization of coal gas, increases using rate of gas and reduces cooling cost greatly.
Online since: November 2016
Authors: Kanokwan Boonritsak, Somchai Puajindanetr
Reduction of Adhesive Joining Defect in Optical Transceiver Assembly Process Kanokwan Boonritsaka and Somchai Puajindanetrb Department of Industrial Engineering, Faculty of Engineering Chulalongkorn University, Bangkok, Thailand 10330 akanokwan.bo@student.chula.ac.th, bfiespj@eng.chula.ac.th Keywords: Optical Transceiver, Adhesive Joining Defect, Flexible Printed Circuit Board Abstract.
An optical Transceiver is a device that is used for transmitting and receiving digital data which is modulated into the light source, and also consisted of two main parts as lens (one for transmitter (Tx) and another one for receiver (Rx)) and flexible printed circuit board (FPCB).
-Position of defect in Thermal Oven Collect data 2 groups (Day and Night shift), sample 100 units for each groups to verify position.
Collect data for 5 groups (30 units per groups) condition in Table 1.
Productivity and quality improvement revenue increment and rejection cost reduction manual component insertion lines through the application of ergonomic.
Online since: September 2014
Authors: E.I. Korotkova, Darya A. Vishenkova, Elena V. Dorozhko
The study of the effect of pH on the reduction peak of MG dye was investigated by cathodic voltammetry in the pH range from 1.65 to 12.
The obtained data showed that the current value reaches its maximum at pH = 1.65.
Fig. 4 – Dependence of current of reduction of complex MG-Hep from concentration of heparin in the electrochemical cell.
The result showed that benzyl alcohol has no influence on the received signal of reduction of MG.
The data obtained during research about decreasing of a signal from complex MG-Hep at E = -0.87 V with increasing concentrations of heparin in the system can be used for the development of the indirect method for determination of heparin in pharmaceuticals.
Online since: May 2016
Authors: Mohammed Ghammouri, M. Benhaddou, M. Abbadi
The last proved to be dependent on the stent diameter reduction, rate and location of restenosis.
The data points are found to be below the Findley's criterion line, as plotted in Fig. 5.
Data points depicted in Fig. 11 show that the two geometries have similar behaviour in terms of their von Mises stress vs. the radial displacement.
This effect is better observed in Fig. 14 where the data points corresponding to the eccentric restenosis are found to be always above the first bisector.
Moreover, for the same diameter reduction, the eccentric restenosis is found to be more harmful than the concentric restenosis.
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