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Online since: September 2018
Authors: Liya D. Mailyan, Dmitry R. Mailyan
Now we determine the reduction degree of the reinforcement consumption taking the precompression into account.
The data given above prove that the elements with mixed reinforcement can be more economical than with precompression of the whole longitudinal reinforcement only if there is a breakage of non-stressed reinforcement, which causes no technological difficulties.
For elements with length reduction of non-stressed rods, compared with length reduction of precompressed reinforcement, the condition of economic advisability of mixed reinforcement will be of the following type: (17) where and – the mass of longitudinal reinforcement, respectively, which is non-stressed in the elements without prestressed reinforcement and previously being precompressed in the elements without non-stressed reinforcement; и – the mass of longitudinal reinforcement in the elements with mixed reinforcement, respectively, non-stressed and precompressed.
Summary Thus, the analysis shows that the reduction of total steel consumption and money spendings on the elements with mixed reinforcement can be achieved only at breakage not less than 50% of the whole non-stressed reinforcement length.
Wherein the increase in relative content in the cross-section of non-stressed reinforcement (at ) leads to the reduction of the ratio , of total steel consumption and reinforcement costs.
Online since: October 2011
Authors: Olufemi P. Abimbola, Temitayo A. Ewemoje
The reduction was greater in green gram than common bean [11].
Monthly mean maximum temperature data for Sokoto was used for determining the monthly crop water requirement (CWR).
Much of the reduction in biomass of the canopy was due to reduced leaf area.
Even though the irrigation amount was halved, there was no significant reduction in yield due to 50%PRD treatment.
A.: Scheduling Deficit Wheat Irrigation with Data from an Evapotranspiration Network.
Online since: July 2017
Authors: Victor Kozlov, Ekaterina Letshiner, Wen Ze Zhao, Jia Yu Zhang
It allows us to use the data of contact stresses distribution over the rake surface of the cutting tool, received in cutting by a sharp cutting tool (without a flank wear land and cutting edge rounding).
Reduction of the normal contact stresses magnitude by three times far from the cutting edge may be due to the high value of contact temperature (Fig. 4) and contact layer softening [2, 9].
Calculation of the temperature field in the cutting wedge by a finite element method at simulation of cutting with use of software ANSYS12 shows good coincidence between theoretical and experimental data.
Reduction of the normal contact stresses magnitude over the flank land by two times in cutting with a rounded cutting edge explains working capacity at considerable wear of a cutting edge in machining titanium alloy. 6.
Reduction of the greatest internal normal stress σy max in a cutting wedge with appearance of insufficient wear over the flank surface explains the reliability of slightly worn-out cutting tools in machining of titanium alloys.
Online since: November 2011
Authors: R. Arumugam, R. Karthikeyan, K. Vijayakumar
The static and transient electromagnetic characteristics have been obtained through the electromagnetic finite element analysis software MagNet6.22.1 while the thermal and vibration aspects have been studied through coupled field Finite Element Analysis employing the multi physics software ANSYS10 while the Impulse hammers excitation - free vibration test using RT Pro Photon data acquisition system facilitated the experimental determination of vibration characteristics.
The study concludes that the advantages of less weight , low torque ripple, low eddy current losses, reduction in vibration level of stator structure coupled with the ability to maintain precise mechanical dimensional tolerance may present SMC-SRG a viable candidate in standalone wind energy conversion systems meant for rural and remote area electrification scheme.
Fig.9.Nodal temperature distribution Fig.10 Circumferential mode shapes The experimental setup for the impulse hammers excitation - free vibration test [5] of the SMC-SRG using RT Pro Photon data acquisition system is shown in Fig.11.
Conclusion This paper delineated the fabrication and testing of Switched reluctance generator structure with SOMOLOY1000, a soft magnetic composite material and the investigation led to the conclusion that the advantages of less weight , low torque ripple, low eddy current losses, reduction in vibration level of stator structure coupled with the ability to maintain precise mechanical dimensional tolerance may present SMC-SRG a viable candidate in standalone wind energy conversion systems meant for rural and remote area electrification scheme.
Online since: July 2006
Authors: M.M. Alaiha, R. Mahmudi
These specimens were then mounted on a texture goniometer, from which the diffracted intensity data was logged into a microcomputer producing {200} pole figures automatically.
In the first four routes, the influence of cold reduction and final annealing on the earing quality is examined.
However, increasing the annealing temperature reduces the earing tendency, the effect being more pronounced at lower values of cold reduction.
The highest earing is observed at the greatest cold reduction of 94% for all annealing temperatures.
In this route after 80% cold rolling, the material was annealed in the temperature range 420 to 540°C and was given another 50% cold reduction before final annealing treatments.
Online since: January 2014
Authors: I. Haryanto, T. Prahasto, Achmad Widodo
Moreover, SVM was modified by introducing wavelet function as kernel for mapping input data into feature space.
Input data were vibration signals acquired from bearings through standard data acquisition process.
In the training process, the data set was also trained using RBF kernel function as comparison.
(a) Daubechies wavelet with PC data (b) Daubechies wavelet with IC data Fig. 3 Separation boundaries of W-SVM.
Vapnik, Estimation Dependences Based on Empirical Data, Springer Verlag, Berlin, 1982.
Online since: July 2014
Authors: Wei Dong Ji, Yan Wie Wang, Zhe Tang
., and there are huge noises as from 6 p.m. in summer and 7 p.m. in winter; in addition, these three buildings were built at an early time, and noise reduction was insufficiently considered.
Design Scheme for Renovation Design scheme for noise reduction We adopted sound-proof wall for noise reduction design.
According to the sound insulation characteristics of the sound-proof wall and by reference to related research data, main measures for improving sound insulation capabilities of sound-proof wall are as follows: (1)Ensure appropriate surface density of single-layer wall Normally, single-layer wall conforms to the “Quality Law” that the bigger the surface density, the better the sound-proof effect.
The weighted sound reduction index for such double-layer walls is generally 6dB ~ 10dB higher than single-layer walls
The scheme for noise reduction was designed by combining all the above measures, as shown in Fig.
Online since: June 2012
Authors: Shan Li, Liang Xu, Yu Qi Wang
Observe the maximum thickening rate, the maximum reduction rate, the maximum stamping direction stress and the size and changes of maximum equivalent stress, thereby finding the appropriate value of the die fillet, and further optimizing in the simulation method.
When the die fillets are 1 and 1.5, the maximum thickening rate and the maximum reduction rate are almost the same.
Table 3 The impact of forming depth on simulation forming forming depth (mm) maximum thickening rate (%) maximum reduction rate (%) maximum stamping direction stress (MPa) maximum equivalent stress (MPa) total deep drawing force (×10N) 3 0.5 1.3 269.2 957.5 5.8 4 1.7 16.5 313.4 997.9 4.8 5 1.4 21.5 302.5 1097.3 2.8 As known from the data in Table 3, with the forming depth increasing, the maximum reduction rate, the maximum stamping direction stress and the maximum equivalent stress have different degrees of increase.
The maximum reduction rate reaches 21.5% and it has been beyond the acceptable range.
Figure 4 The impact of BHF on Figure 5 The impact of BHF on Figure 6 The impact of maximum the maximum thickening rate the maximum reduction rate stress in the negative Z direction Figure 7 The impact of maximum Figure 8 The impact of BHF on Figure 9 The impact of BHF on Stress in Z direction the equivalent stress the total deep drawing force It can be seen from Figure 4 to Figure 9, with the BHF increasing, the maximum thickening rate of the sheet’s thickness reduces at first, then increases, while the reduction rate increases and then decreases, but the change is relatively small.
Online since: January 2005
Authors: Chong Sool Choi, In Jin Shon, Seok Jae Lee, Young Seob Seo, Young-Kook Lee, Yong Hwan Jeong
After recrystallization annealing the austenite grain sizes were investigated as a function of the reduction in thickness for the two initial structures. 2.
The As increased from 300 to 440℃ with increasing the deformation from zero to 90% in thickness reduction, and the Af from 400 to 480℃.
Fig. 5 shows a plot of the recrystallized austenite grain size versus the reduction in thickness after annealing for 1 hour at 800℃.
The grain size of recrystallized austenite produced from the martensite is much smaller than that from the original austenite at any reductions of thickness.
All data points are in accord with a straight line.
Online since: December 2013
Authors: Jie Zhang, Yong Chen, Ji Gan Wang, Chuan Yu Liu, Shu Shu Huang
Introduction Carbon emission permits allocation in power industry is the primary task to carry out market-oriented power carbon reduction.
There are many methods, such as method based on historical emissions, auction method, method based on the latest data, method based on zero DEA, based on the B-S option pricing model, and so on[2-6].
Through gathering historical data of each index, we make trend prediction according to the historical data to get the lowest and highest attribute values.
How can China reach its CO2 intensity reduction targets by 2020?
:Sharing the Carbon Emission Reduction Responsibility across Chinese Provinces: A Zero Sum Gains DEA Model: Resources Science.11(2012), p2087-2096 [6]Perssonetal A, Azar C,Lindgren K.Allocation of CO2 emission Permits-Economic incentives for emission reductions in developing countries: Energy Policy. 11(2005), p11-14
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