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Online since: September 2015
Authors: Ravi Ranjan Kumar, Ashish Kumar Pande, Alok Singh, P.V. Venkitakrishnan
Bend is made across the metal grain or in the direction of rolling.
Can be produced in a minimum number of set-ups.
Modification in Mounting Bracket (DFA): The two numbers brackets are welded on convergent cylindrical portion of thrust chamber after brazing.
Online since: May 2006
Authors: Meinhard Kuntz, Martin Dietrich, Patricie Merkert, Christoph Krause
Today's materials have substantially lower grain size and posses a much higher density level than early ceramics.
In contrast, implant failure is in general not caused by any material degradation, as it has been shown that strength of the material is maintained without noteworthy degradation over a much longer time span. 0 10 20 30 40 50 60 70 80 90 100 0 12 24 36 48 60 72 84 96 108 Months Accumulated implant failures [%] Fig. 1: Accumulated number of ceramic implant failures versus implantation duration of all reported cases up to May 2005 Through this analysis an extrapolation of expected complication rates per production year can be established, as it is shown in Fig. 2.
For example, from production year 2000 the number of failures that have been reported until May 2005 equal a failure rate of 0,028%.
Online since: February 2014
Authors: S.M. Mohaiminul Islam, Bishwajeet Pandey, Md. Mahbub-E-Noor, Shah Md. Tanvir Siddiquee, Shashank Jaiswal
Moreover, individual cell balancing and monitoring circuit with a lesser size are required in a large number of battery cells.
For a large number of battery cells, a traditionally equalizer has the inconvenience of individual cell balancing and the implementation size problem as well as the cost [5].
Park , Gun-Woo Moon , “A Modularized Two-Stage Charge Equalizer With Cell Selection Switches for Series-Connected Lithium-Ion Battery String in an HEV”, IEEE Transactions on Power Electronics, Volume: 27, Issue: 8, pp. 3764-3774, 2012 [6] Vishal Gupta, Montek Singh, “Energy conservation in asynchronous systems using self-adaptive fine-grain voltage scaling”, International Green Computing Conference (IGCC), pp. 1-8, 2013 [7] C.
Online since: February 2006
Authors: Jian Bao Li, Gang Feng Guo, Hong Lin, Xiao Zhan Yang, Long Liang, Ming Sheng He
Size(um) Sintering temperature(°C) 1 200(1#) 1250 2 200(1#) 1275 3 200(1#) 1300 4 200(1#) 1325 5 200(1#) 1350 6 300(2#) 1250 7 300(2#) 1275 8 300(2#) 1300 9 300(2#) 1325 10 300(2#) 1350 Results and Discussion Corresponding to its processing parameters, a number of data were collected to characterize the microstructure of the ceramic body .The mean pore size, overall porosity, PWP and permeability can all be shown as a function of the sintering temperature, where the smaller sized samples are compared with the larger ones.
Since no continuous interconnection was in the powder compacts, the porosimetry results in Fig. 2 actually reflect the size and distribution of pore channels between SiC grains.
Figure 4 shows the PWP behavior of all the samples tested at a number of different pressures.
Online since: May 2013
Authors: Hui Shi, Hui Li
After late N23, E32 source rocks in Zhahaquan depression begin entering the oil generation peak,and a large number of oil and gas have accumulated in traps.
Two plateau uplifts happen in the first deformation stage and the southwest Qaidam Basin has experienced a paleosedimentary environment from transgression to standing water, which forming fine-grained sediments and making E31~ N1 organic matters the main source.In this stage, source rocks of E31 enter hydrocarbon threshold at Early N1.However,the hydrocarbon generated at this time immediately suffer damaged to bitumen because of the strong structure movement at Middle N1.
Furthermore, source rocks of E32 in depression has been matured at N23 and a larege number of oil and gas have accumulated in traps of halling wall after the adjustment in Quaternary.
Online since: October 2014
Authors: Jaeho Choi, Stephen Kotiang
Marshall and Palmer (M-P) proposed an appropriate analytical approximation of the DSD modeling [5]; the exponential distribution given by the following relation in Eq. 1, , (1) where n(D) is the number density (mm–1m–3) of rain drops per unit volume and D (mm) is the drop diameter.
In our analysis, we obtain the total number of particles by integrating Eq. 3 over all diameters using a three-parameter gamma distribution with parameters(m+ 4) = 9.02R0.114, b= 8.37R– 0.0715 and NT = 255R0.187that fit well the rain data from tropical regions [7].
(13) Based on the recommended prediction procedure by ITU-R [10], the rain specific attenuation grain (dB/km) is calculated from the rain rate Rusing the power-law relationship as , (14) and the empirical parameters k and α are determined as functions of rain characteristics.
Online since: June 2013
Authors: Wan Xu, Guang You Yang, Jing Jing Zhou
(1) : The number of reference cs ;: The local time that node j receives reference message k; : The local time that node i receives reference message k; After the time synchronization has been completed, the instability of the crystal can cause clock skew, which can result in the node time error gradually.
(3) (4) (5) (6) :The moment of receiving broadcast message k at node r1; :The moment of receiving broadcast message k at node r2; n :The number of reference message.
[3] Elson J, Girod L, Estrin D, etal: Fine-grained Network Time Synchronization Using Reference Broadcasts.
Online since: July 2011
Authors: Wei Jian Yang
Main features of EP1C3T144C6.① 2,910 logic elements (LE); ② 13 M4K RAM blocks (4Kbit + parity); ③ 59,904 a total amount of RAM (bit) ④ 1 PLLs; ⑤ 104 largest user I / O number; ⑥ 627,376 bit binary configuration file (. rbf) Size (bit).
Provided full use of the chip PLL (phase locked loop) to achieve resolution of the timer 4.17ns, and designed a number of counters inside the EP1C3T144C6 automatically returned to the ultrasonic echo count, re-use of the internal MCU 32-bit timer read out, after the operation, the thickness can be tested.
Cr-Mo steel, the average grain size of the ultrasonic nondestructive evaluation [J].
Online since: July 2011
Authors: Jin Gang Qi, Jian Zhong Wang, Shan Dai, Zuo Fu Zhao
The results indicate the scope of the equiaxed crystal grain expanded and the growth of the column crystal is restrained in the meantime, the coarse columnar crystals has almost disappeared, and the orientation of the columnar crystal also has been changed slightly, the treatment effect of melt were closely related to the variation of liquid metal structure by applying EPM.
According to classical nucleation theory, Gibbs free energy is changed in phase transition process, it can be expressed as: (1) Where, n is nucleation number, ∆GV is free energy difference value between new phase atoms and old phase atoms; η is Shape coefficient; ηn2/3 is the superficial area of nuclei; γ is the average surface energy; Es is every atom strain energy of the nucleation.
According to the law of thermodynamics, only when the temperature is below transition temperature, and ∆GV is negative, namely |∆GV |> Es, the nucleation could began, the critical nucleation energy in solid-phase transformation is obtained: (2) The nucleation rate of solid transformation is: (3) Where, N is each phase atomic number of unit volume; ν is atomic vibration frequency; is the atomic migration-activate energy between new phase and old phase.
Online since: October 2020
Authors: Solange T. da Fonseca, Paulo Roberto Mei, Clélia Ribeiro de Oliveira, Eloá Lopes Maia, Marcelo Martins, Julián Arnaldo Ávila Díaz
Introduction The superduplex stainless steels (SDSS) are classified as materials having a PREN (Pitting Resistance Equivalent Number) above 40 [1] it is meaning a high resistance to corrosion, and also presents high mechanical strength [2].
Since high temperatures and then abrupt cooling occurs, ferrite saturation of austenite stabilizing elements such as Ni may occur, and during cooling or subsequent passes, a localized precipitation of small austenite grains, known as secondary austenite (γ2) occurred [3].
· After the PWHT the hardness in the FZ was uniform with the BM and decreased from 300 HV for 260 HV; Acknowledgment The authors would like to thank LNNano/CNPEM for the use of the durometer Future-Tech FV 800 model, the FEM/UNICAMP, the Conselho Nacional de Desenvolvimento Cientifico e Tecnológico (CNPq) – process number 142260/2016-9, the Espaço da Escrita – Pró-Reitoria de Pesquisa – UNICAMP - for the language services provided and SULZER BRASIL S.A. by the material supply.
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