共查询到19条相似文献,搜索用时 31 毫秒
1.
Basman Necati Uzun Rukiye Gocer Ebru Bacaksiz Emin Kolemen Ugur 《Microsystem Technologies》2018,24(5):2287-2294
Microsystem Technologies - In this study, a silicon doped diamond-like carbon (DLC) nanocomposite film was deposited electrochemically and it was used to fabricate an Ag/Si–DLC/p-Si... 相似文献
3.
Lemettre Sylvain Seok Seonho Isac Nathalie Moulin Johan Bosseboeuf Alain 《Microsystem Technologies》2017,23(9):3893-3899
Microsystem Technologies - Cu–Sn intermetallic diffusion has been studied with thin Sn and Cu films deposited by physical vapor deposition. It was found that annealing time is critical to the... 相似文献
4.
In this work, a model modal predictive control (MMPC) strategy is proposed to stabilize the falling liquid film thickness in the vertical tubes modelled by the Kuramoto–Sivashinsky (K–S) equation in the presence of naturally present state and input constraints. The novel features of proposed synthesis is the development of an infinite dimensional PDE state representation which incorporates the exact transformation of boundary into the distributed control setting and benefits arising from the property of decoupled boundary applied input actuation and K–S PDE modal states. Furthermore, the dissipative structure of the K–S spectral operator provides the foundation for the model modal based predictive controller (MMPC) synthesis which utilizes the finite dimensional state representation to formulate the quadratic objective function while the infinite dimensional K–S PDE state constraints are appropriately defined and cast in the form of a constrained quadratic programme. Finally, we demonstrate that if feasible, the MMPC achieves stabilization of the thin film thickness and satisfies naturally present state and input constraints. Numerical simulation of the boundary applied actuation evaluates the proposed method's performance. 相似文献
5.
The formation behaviour of calcium zirconate (CaZrO3) at the interface between the CaO–SiO2–MgO–CaF2(–ZrO2) slags (B(=(mass% CaO) /(mass% SiO2)) = 2.0) used in the AOD converter and the MgO refractories has been computed by employing a commercial thermodynamic software. The solubility of zirconia (ZrO2) in the liquid CaO–SiO2-7 mass% MgO slag phase is relatively small, viz. about 2–3 mass% and the CaZrO3 phase is formed at about B>1.5. The region of fully liquid phase extends to the composition saturated by dicalcium silicate (Ca2SiO4) and cubic ZrO2 (B∼1.2). The effect of 7 mass% CaF2 addition on the solubility of ZrO2 in the liquid slag phase was computed to be negligible, while the liquid phase exists through the entire compositions. In addition, the region of fully liquid phase extends to the more basic composition range (B∼1.5), where the saturating phases are the Ca2SiO4 and CaZrO3. The thermodynamic calculations indicate CaZrO3 not to form at (mass% ZrO2) /(mass% MgO) ((=Z/M))<0.6. In the “ Liquid+Ca2SiO4+MgO” region, the activity of SiO2 in the liquid phase is nearly fixed because the activity of CaO in the liquid phase is unaffected by the activity of ZrO2. However, with higher ZrO2 activity from the increase in the Z/M ratio, the activity of CaO in the liquid phase is expected to decrease due to the formation of CaZrO3. The formation behaviour of CaZrO3 in the slags, computed based on the Gibbs energy minimization principles, could experimentally be confirmed by employing the XRD and SEM–EDS analysis. 相似文献
6.
Guangrong Shen Abdoul Nasser Ibrahim Zijun Wang Chuang Ma Jianhua Gong 《International journal of remote sensing》2013,34(15):4037-4053
Land-use/land-cover (LULC) changes are occurring at rapid rates on the Chongming Island of Shanghai, China, giving rise to a major concern about environmental impacts. We herein carried out a sound analysis of the LULC dynamics, the conversions among different LULC classes, and land-surface temperature (LST) distribution using remote-sensing data from Landsat Multispectral Scanner (MSS), Thematic Mapper (TM), and Enhanced Thematic Mapper Plus (ETM+) time series spanning the last 35 years (1979–2014). Based on LULC class information and LST, we constructed a temperature/vegetation index space to study the temporal variability of thermal data, vegetation cover, and LULC. The results showed that the LULC change dynamics in Chongming Island have strongly impacted the LST in the recent decade. The spatial position conversion and quantitative change of vegetation cover totalled about 44.4% of LULC-type areas over the Island, and the comprehensive LULC dynamicity changed from 2.97 to 3.95 during the investigated period. Accordingly, significant LST changes took place in the portion of the Chongming Island showing normal temperature range, which accounted for 85.94% of the whole Island’s area as of 1 August 2000 and that decreased to 50.79% on 6 May 2009, while the surface extents under low- and with ultra-high-temperature ranges increased, respectively, both from 0 of 2000 to 6.67% and 0.41% of 2009. The results indicate that the pixel classes including vegetation cover, wetland, and waterbody, which have larger dynamicity and maximum change vector magnitudes, played a large role in alleviating the effect of the land-surface thermal environment, and were key driving factors contributing to the increasing trend of non-normal temperature range ratio over time. Our findings are expected to provide valuable information for decision-making regarding the development and construction of Chongming Island into an eco-region. 相似文献
7.
Y. V. Venkatesh 《控制理论与应用(英文版)》2014,12(3):250-274
New conditions are derived for the l2-stability of time-varying linear and nonlinear discrete-time multiple-input multipleoutput (MIMO) systems, having a linear time time-invariant block with the transfer function F(z), in negative feedback with a matrix of periodic/aperiodic gains A(k), k = 0,1, 2,... and a vector of certain classes of non-monotone/monotone nonlinearities φp(-), without restrictions on their slopes and also not requiring path-independence of their line integrals. The stability conditions, which are derived in the frequency domain, have the following features: i) They involve the positive definiteness of the real part (as evaluated on |z| = 1) of the product of Г (z) and a matrix multiplier function of z. ii) For periodic A(k), one class of multiplier functions can be chosen so as to impose no constraint on the rate of variations A(k), but for aperiodic A(k), which allows a more general multiplier function, constraints are imposed on certain global averages of the generalized eigenvalues of (A(k + 1),A(k)), k = 1, 2 iii) They are distinct from and less restrictive than recent results in the literature. 相似文献
8.
《Calphad》2004,28(3):321-327
The water activities of the mixed aqueous electrolyte {(y) NH4NO3+(1−y) LiNO3)}(aq) are measured at total molalities from 0.2 mol kg−1 to about saturation for different ionic-strength fractions of NH4NO3 with . The results allow the deduction of osmotic coefficients. The experimental results are compared with the predictions of the Zdanovskii–Stokes–Robinson (ZSR), Robinson and Stokes (RS), Lietzke and Stoughton (LS II), Reilly–Wood–Robinson (RWR) mixing rules and the Pitzer model. From these measurements, the Pitzer mixing ionic parameters are determined and used to predict the solute activity coefficients in the mixture. The excess Gibbs energy is also determined. 相似文献
9.
10.
Phase equilibria and thermodynamic properties at 1 bar in the Y 2O3–Al2O3–SiO2 ternary system and its constituent binaries Y 2O3–Al2O3 and Y 2O3–SiO2 have been reevaluated using the CALPHAD approach. The liquid phase is described by the ionic two-sublattice model with the formula (Al+3,Y +3)P(AlO2−1,O−2,SiO4−4,SiO20)Q. The SiO2 solubility in the YAM phase was described using a compound energy model. Two datasets of self-consistent model parameters are presented. However, the rather meagre and scattered experimental data imply that the present assessments should be regarded as provisional. Some critical experiments are suggested for this system. 相似文献
11.
Frank G. Lether 《Journal of scientific computing》2000,15(4):479-497
This paper uses properties of the Weyl semiintegral and semiderivative, along with Oldham's representation of the Randles–Sevcik function from electrochemistry, to derive infinite series expansions for the Fermi–Dirac integrals
j
(x), –j=–1/2, 1/2. The practical use of these expansions for the numerical approximation of
–1/2(x) and
1/2(x) over finite intervals is investigated and an extension of these results to the higher order cases j=3/2, 5/2, 7/2 is outlined. 相似文献
12.
The kinematics/statics and workspace of a 2(SP+SPR+SPU) serial–parallel manipulator are studied systematically. First, a 2(SP+SPR+SPU)
manipulator including an upper and a lower SP+SPR+SPU parallel manipulators is constructed, and the inverse/forward displacements,
velocity, acceleration and statics of the lower/upper parallel manipulators are studied, respectively. Second, the kinematics
and statics of the lower/upper manipulators are combined and the displacement, velocity, acceleration, statics, and workspace
of a 2(SP+SPR+SPU) manipulator are analyzed systematically. Third, the analytic solutions’ examples are given and verified
by the simulation mechanism. This manipulator has some potential applications for the robot’s arm, leg, and twist, the serial–parallel
machine tools, the sensor, the surgical manipulator, the tunnel borer, the barbette of warship, and the satellite surveillance
platform. 相似文献
13.
14.
Binodal data for 2-propanol + potassium/sodium carbonate + water systems and ethanol + sodium carbonate + water system were experimentally determined at 298.15 K, and the phase diagram was plotted. Three empirical equations were used to correlate binodal data. Base on the proposed equation with highest accuracy and lever rule, the phase equilibrium compositions for 2-propanol + potassium/sodium carbonate + water system were directly calculated by MATLAB. The Othmer–Tobias equation and the Bancroft equation were used to correlate tie-line data. The results indicate that the calculation method and corresponding tie-line data are reliable. The effect of salts on phase-separation was discussed. Salting-out coefficient and effective excluded volume of potassium carbonate and sodium carbonate in 2-propanol–water component solvent were calculated to evaluate the salting-out ability of salts. An effective excluded volume of sodium carbonate in ethanol/2-propanol–water component solvents was used to evaluate the phase-separation ability of investigated alcohols. Based on the experimental and calculated results, it can be concluded that sodium carbonate shows a higher salting-out ability than potassium carbonate and 2-propanol is easier to be excluded to the alcohol-rich phase than ethanol. 相似文献
15.
16.
17.
《Applied ergonomics》1987,18(4):346-347
18.
This paper intends to make an in-depth study on the symmetry properties and conservation laws of the () dimensional time fractional Zakharov–Kuznetsov–Benjamin–Bona–Mahony (ZK–BBM) equation with Riemann–Liouville fractional derivative. Symmetry properties have been investigated here via Lie symmetry analysis method. In view of Erdélyi-Kober fractional differential operator, the reduction of () dimensional time fractional ZK–BBM equation has been done into fractional ordinary differential equation. To analyse the conservation laws, new theorem of conservation law has been proposed here for constructing the new conserved vectors for () dimensional time fractional ZK–BBM equation with the help of formal Lagrangian. 相似文献
19.