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Online since: September 2013
Authors: Franco Cotana, Mirko Filipponi, Beatrice Castellani
It allows to attain uniform stack compression strain, uniform gases distribution and the reduction of internal electric resistance by enhancing the contact between the electrodes and the distribution system.
It allows: - the management of the stack heating system; - the management of n.7 flow-meters and the valves of the distribution system of gas and demineralized water; - the acquisition of the stack electrical parameters, including the voltage of the single cells; - the acquisition of data from the thermocouple sensors installed in the stack; 7) a biogas cleaner based on active carbon filters; 8) the gas pumping and distribution system; 9) the exhaust gas extraction system; 10) the air extraction system.
A reduction of the open-circuit voltage and the maximum power was shown by reducing the supplied hydrogen, but the low reduction rate vs. the hydrogen reduction states that the CMCFC plant is able to correctly operate even when supplied with biogas.
Online since: August 2013
Authors: Xiao Yun Zhao, Xing Xing Qi, Qian Chen, Qi Zhou, Chao Jie Zhang
Methods known so far are Dialysis Pretreatment, Catalytic Reduction, Reverse Osmosis (RO) and nanofiltration (NF).
Catalytic reduction of nitrate is another way to lower the DIN/TDN ratio[5].
Extensive testing has indicated that catalytic reduction of nitrate is not suitable for DON determination.
The final progress is data processing, the concentration of the DON1=TDN- NO3- -NH4+ -NO2-, and the concentration of the original sample is DON2=DON1/R.
,Croue´, Evaluation of the catalytic reduction of nitrate for the determination of dissolved organic nitrogen in natural waters.
Online since: February 2016
Authors: Jacek Pawlicki, Piotr Amrogowicz, Anna Urbańczyk-Gucwa
Main parameters affecting plastic flow and accordingly total effective strain eft are: rolling reduction εh (%), rolling rate v (rpm), amplitude of transverse movement of rolls A (mm), frequency of transverse movement of rolls f (Hz).
Regulation of measurement system, data record are realized by NEXT VIEW 3.4 system.
Conventional rolling was conducted with this same rolling rate (v) and rolling reduction (6 passes, each εh = 12%) but f = 0 Hz and A = 0 mm.
Total effective strain obtained in RCMR method can be calculated with formula: (1) (2) (3) Total effective strain obtained for conventional rolling can be calculated with formula: (4) where: εft – total effective strain εhi – strain included by rolling reduction εti – strain included by transverse movement of working rolls n – number of passes hi-1, hi – height of sample before and after unit pass (reduction) A - amplitude of cyclic movement The investigation of microstructure and substructure were performed using a Olympus HX51 light microscope, and scanning transmission electron microscope (STEM) Hitachi HD-2300A respectivelly.
Online since: March 2012
Authors: Guo Fang Li, Lin Yan Zhang, Shuang Liu, Xiang Chen
After an analysis of the AG4 automatic transmission shifting process, a new method for shifting quality control is designed, which is in accordance with the expected oil pressure control of the engaging parts during the shifting transition period, thus reducing shifting shock, improving ride comfort and resulting in reduction of dynamic load of the power transmission system, and extending the working life of the parts.
To achieve parameter sharing for the sensors in the power transmission system and apply dual ECU control for shifting control, the transmission ECU and engine ECU are connected through data bus.
There is a comparatively big reduction in angular acceleration of the output shaft, and the acceleration starts to increase gradually in advance, smoothing the connection of the engaging parts and reducing the torque fluctuation of the output shaft.
a) The speed b) The angular acceleration c) The impact degree Fig.5 The result of output shaft from 2nd to 3rd up-gearing process (2) During the 3rd-2nd down-gearing process of the AG4 automatic transmission, there is a noticeable reduction in output speed, angular acceleration and the peak value of impact of the output shaft, and also a reduction in the magnitude of change after applying new oil pressure change control.
Online since: September 2007
Authors: Han Seung Lee, Sang Heon Shin, Je Woon Kyung
Table 1 Types of specimen Series Symbol Name of specimen Tension rebar Usage of CFS Common data BS Sound 3-D13(0.87%) Not used BD Model Not used BDC1 Strengthened 1 sheet, horizontal BDC3 Strengthened 3 sheets, horizontal 1 BDC1A Strengthened 3-D10(0.49%) 3-D10(0.49%) 3-D10(0.49%) 3-D10(0.49%) 1 sheet, horizontal, anchored BCD2-0 Corroded Not used BCD2-13 Strengthened Injection+1 sheet, anchored 2 BCD2-23 Strengthened 3-D13(0.87%) 3-D13(0.87%) 3-D13(0.87%) Backfill+1 sheet, anchored Cross section bxD=200x250mm Shear span ratio = 3.4 Stirrup ratio = D6-@50 (0.64%) Fig. 1 Configuration of specimen Fig. 2 Patterns of CFS sheeting Results and Discussion Load-deflection relationship.
The maximum strength of BD was 67% of that of BS, and the rate of decrease in strength was small for the amount of reduction in the cross-sectional area of reinforcement.
For the Series 1 specimens, however, the index value was multiplied by a reduction factor (α= 1/2) in view of the fact that stresses at the time of sheet detachment were about 1/2 of the material strength.
Pt×σy = Pst×σsy + Pcf×σcf×α (1) Pcal = 2M/L, M = (0.9×at×σsy×ds) +(0.9×af×Ef/Es×σcf×α×D) (2) where, Pst: tension reinforcement ratio, σsy : yield stress of steel, Pcf = Acf/BD, B: width of beam Acf: cross-sectional area of CFS, D: depth of beam, σcf: tensile strength of CFS L: shear span length, at: cross-sectional area of steel, af: cross-sectional area of CFS ds:effective depth of beam, α: reduction factor Fig. 5 The amount of reinforcement and maximum load Fig. 6 Comparison of measured and calculated values Outline of finite element analysis.
By modeling stress relief and stiffness reduction by use of bond elements, sharp decreases in strength due to the detachment of CFS were expressed successfully.
Online since: September 2014
Authors: Oleg N. Komarov, Igor G. Sapchenko, Sergey G. Zhilin
The exothermic oxidation-reduction reaction may form the basis of such technological process.
This reaction is that iron reduction of wastes with simultaneous obtaining of steel melt [1, 2].
For instance, it is necessary to know effect of oxidation-reduction reaction thermophysical properties on waste of metal, generation of slag pockets and gas pores, disagreement between the received and specifying chemical composition of casting [2].
Meanwhile, growth of melt temperature leads to its aeration, boiling and splashing, as well as to decrease of fire resisting property of equipment, increase of components waste, changes in chemical composition of metal and even reduction in volume below 50% of theoretical volume.
The results of experimental and theoretical data comparison assign optimum relationship between initial temperature and deoxidizing agent concentration in thermite.
Online since: August 2013
Authors: Song Xiao Hui, Xu Jun Mi, Wen Jun Ye, Yan Yan Fu
The data shows that the ultimate strength and yield strength decrease but elongation and reduction of area increase as aging temperature increase.
Solution temperature has very little effect on elongation and reduction of area.
The elongation and reduction of area varied from 7.0 to 12.0% and 17.0 to 22.0% respectively.
Conclusion 1) As the solution temperature increase, the quantity and size of primary α phase of microstructure increase, resulting in lower tensile strength but higher ductility slightly. 2) Increasing of aging temperature resulted in the increase of ductility and reduction of tensile strength,, which is attributed to the coarsening of precipitated α phase. 3) After (α+b) solution and aging treatment, the microstructure consists of primary α phase and transformed b phase with fine αs phase precipitating to improve the tensile strength effectively.
Online since: September 2014
Authors: Ting Wang, Wen Ling Fan Li, Ying Ping Ma, Jun Hua Zhang, Huai Bao Ma
General situation of Zhenshui Xiaolangdi Reservoir is a comprehensive utilization project and its development mission was definitely oriented to flood control (including ice prevention) and sedimentation reduction, and balanced water supply, irrigation and hydropower generation.
Therefore, the apparent sand bar came into being at Zhenshui estuary and the height was about 5.78m (a) (b) Fig. 2 Profile and cross section of Zhenshui Results of model test Introduction of test: In the research of operational mode of Xiaolangdi Reservoir for flood control and sedimentation reduction during later sediment retaining period, three groups of model test were conducted out.
Field observation data show that: there is little incoming water and sediment in Zhenshui, and basically there is no sediment.
When reservoir water level declines, if water level difference is not enough to influence the stability of the sand bar or the sand bar is not completely broken, then the isolated water body will come into being, the internal storage capacity of tributary will not be effectively used, and the efficiency of sedimentation reduction and even flood control will be affected.
P., and Wang Y.: Report on model test of the first operational mode of Xiaolangdi Reservoir for flood control and sedimentation reduction during later sediment retaining period (Yellow River Institute of Hydraulic Research, YRCC, China 2010, In Chinese ).
Online since: October 2018
Authors: Yuriy V. Yurkin, V.V. Avdonin, A.N. Volotskoy
Hardness reduction of ethylene-vinyl acetate at the adding of plasticizers happens thanks to intensity decreasing of intra-and intermolecular chaininteractions.
As a result the polymeric blend becomes less rigid and more resilient, that is seen in reduction of dynamic modulus of elasticity.
These data are well matched with the results introduced in table 2.
As a result there is an interaction reduction between macromolecules, and at an extension polymeric chains move easier.
Both increasing and decreasing of value of solubility parameter of plasticizerleads to reduction of tensile strength and to magnification of elongation at break of ethylene-vinyl acetate.
Online since: May 2014
Authors: Thunyalux Ratpukdi, Phonrawee Wonghad, Nadthapon Boonlerdlon, Banhan Nanthakod
A calibration curve was developed from known concentration and strong correlation between concentrations and absorbance was obtain with R2 of 0.9998 (data not shown).
It appeared that reduction of color fits the first order kinetic reaction.
However, there was no different in reduction rate when increased HCO3-from 450 mg/L as CaCO3 to 900 mg/L as CaCO3 Fig. 2 Removal of Novacron Orange C-3R by VUV and UV.
Fig. 5 shows the COD reduction of by VUV and UV processes.
Complete COD reduction was observed at highest VUV powers (120 W) employed in this research.
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