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1.
N. Parandin M. A. Fariborzi Araghi 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2010,15(4):729-741
In recent years, many numerical methods have been proposed for solving fuzzy linear integral equations. In this paper, we
use the divided differences and finite differences methods for solving a parametric of the fuzzy Fredholm integral equations
of the second kind with arbitrary kernel and present some examples to illustrate this method. 相似文献
2.
As the use of automation in industry accelerates, the development of flexible, electrically conducting materials with the requisite environmental resilience for impact‐resistant sensors, foldable electronics, and electrostatic shielding are needed; simultaneously, recyclability for these materials remains a crucial attribute. Traditional conductive stretchable materials, such as rubbers, are not recyclable, and hydrogel materials have limited applications due to water evaporation and operating temperature range. Comparatively, organogels can be formulated with enhanced tunability, matrix recyclability, and the ability to support many conductive fillers. Here, rheology, mechanical testing, and electrochemical impedance spectroscopy (EIS) characterize the nanoscale interactions between carbon fillers, the liquid phase, and the network matrix in hemiaminal dynamic covalent network (HDCN) organogels. HDCN chemical equilibria are shown to strongly influence macroscopic gel properties, while HDCN composites exhibit very high conductivities up to 9.95 mS cm?1 appropriate for sensing applications, demonstrating promise as recyclable alternatives for conductive stretchable materials. 相似文献
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In the present work, the effect of applying ternary Ni–P–B4C composite coating from an electroless plating bath containing sulfate nickel, sodium hypophosphate and suspended B4C particles, on the corrosion and wear resistance of an AZ91D, high aluminum cast magnesium alloy, was investigated. Regarding low corrosion resistance of magnesium alloys, chromium oxide plus HF (Hydro Fluoric Acid) pretreatment was applied to prepare the substrate for coating treatment in electroless bath. The pH value and temperature of the electroless bath were 9 and 82 °C, respectively. The coating was characterized for its micro structure, morphology, microhardness, wear and corrosion resistance. SEM (Scanning Electron Microscope) observation showed dense and coarse nodules in the ternary composite coating and the cross section of Ni–P–B4C coating offered presence of well dispersed B4C particles in the coating. The hardness of the Ni–P–B4C composite coatings was around 1200 MPa, more than what can be obtained for Ni–P coatings (about 700 MPa). The wear test which was carried out by using pin on disc method, showed that ternary Ni–P–B4C composite coating had a good wear resistance and more superior than Ni-P coating. The polarization test results for ternary Ni–P–B4C composite coating exhibited good corrosion resistance properties in protecting the AZ91D magnesium alloy, but not better than Ni–P coating. 相似文献
5.
Mohammad Ali Fariborzi Araghi Amir Fallahzadeh 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2013,17(1):159-163
In this paper, we use the inherited LU factorization for solving the fuzzy linear system of equations. Inherited LU factorization is a type of LU factorization which is very faster and simpler than the traditional LU factorization. In this case, we prove some theorems to introduce the conditions that the inherited LU factorization exists for the coefficient matrix of fuzzy linear system. The examples illustrate that the proposed method can be used in order to find the solution of a fuzzy linear system simply. 相似文献
6.
This paper presents a detailed review on free piston Stirling engines (FPSEs) technology. Generally, the Stirling engines can be categorized into two broad classes comprising kinematic and dynamic converters among which FPSEs are known as the dynamic type. Other well-known dynamic Stirling converters are Fluidyne and thermosacoustic engines among which the thermosacoustic ones are the most advanced Stirling converters recently presented. In this research, the dynamic Stirling engines are first introduced and reviewed. Then, the review work is directed toward the FPSEs, one of the most reliable dynamic Stirling converters utilized in different applications such as combined heat and power systems (CHPs). Subsequently, the working principles of different types of FPSEs and their performance are summarized. Next, several manufactured FPSEs, as well as their corresponding features and applications, are discussed. Finally, the article is conducted to analysis and modeling approaches of FPSEs. Accordingly, linear and nonlinear analytical techniques of FPSEs are introduced, and some comparative data are provided to verify the modeling schemes. Then, various design parameters affecting the engine performance are introduced and studied. The outcomes of this review work demonstrate the potential of FPSEs for different applications and reveal that the perturbation-based model is likely the most comprehensive nonlinear method for modeling and design of the FPSEs. 相似文献
7.
Geert Hellings Andriy HikavyyJerome Mitard Liesbeth WittersBrahim Benbakhti AliReza Alian Niamh WaldronHugo Bender Geert Eneman Raymond Krom Andreas Schulze Wilfried Vandervorst Roger LooMarc Heyns Marc MeurisThomas Hoffmann Kristin De Meyer 《Thin solid films》2012,520(8):3326-3331
The Implant-Free Quantum Well Field-Effect Transistor (FET) offers enhanced scalability in a planar architecture through the integration of heterostructures. The Implant-Free architecture fully utilizes the band offsets between different materials, whereby charge carriers are effectively confined to a thin channel layer. This prevents sub-surface source/drain leakage observed in classical bulk Metal-Oxide-Semiconductor FETs at small gate lengths. An investigation of the VT-tuning capabilities of this technology reveals sensitivity to both well doping and bulk voltage. 相似文献
8.
Leily Majidi Poya Yasaei Robert E. Warburton Shadi Fuladi John Cavin Xuan Hu Zahra Hemmat Sung Beom Cho Pedram Abbasi Mrton Vrs Lei Cheng Baharak Sayahpour Igor L. Bolotin Peter Zapol Jeffrey Greeley Robert F. Klie Rohan Mishra Fatemeh Khalili‐Araghi Larry A. Curtiss Amin Salehi‐Khojin 《Advanced materials (Deerfield Beach, Fla.)》2019,31(4)
The optimization of traditional electrocatalysts has reached a point where progress is impeded by fundamental physical factors including inherent scaling relations among thermokinetic characteristics of different elementary reaction steps, non‐Nernstian behavior, and electronic structure of the catalyst. This indicates that the currently utilized classes of electrocatalysts may not be adequate for future needs. This study reports on synthesis and characterization of a new class of materials based on 2D transition metal dichalcogenides including sulfides, selenides, and tellurides of group V and VI transition metals that exhibit excellent catalytic performance for both oxygen reduction and evolution reactions in an aprotic medium with Li salts. The reaction rates are much higher for these materials than previously reported catalysts for these reactions. The reasons for the high activity are found to be the metal edges with adiabatic electron transfer capability and a cocatalyst effect involving an ionic‐liquid electrolyte. These new materials are expected to have high activity for other core electrocatalytic reactions and open the way for advances in energy storage and catalysis. 相似文献
9.
Strategies to improve the geometric accuracy in asymmetric single point incremental forming 总被引:2,自引:0,他引:2
Asymmetric incremental sheet forming (AISF) is a manufacturing process for the small batch production of sheet metal parts.
In AISF, a sheet metal part is formed by a forming tool that moves under CNC control. AISF currently has two dominant process
limits: sheet thinning and a limited geometric accuracy. This paper focuses on the latter limit. It is shown with a pyramidal
part that multi-stage forming can yield an increased accuracy compared to single-stage forming. However, due to residual stresses
induced during forming, the accuracy of the as-formed part can be lost if the part is trimmed after forming. A case study
with a car fender section shows that the geometric accuracy of the final part can be improved compared to single-stage forming
by a combination of multi-stage forming and stress-relief annealing before trimming. 相似文献
10.
ABSTRACTThe aim of this study is to simplify the process of discharge thermal energy combined desalination with power system by integrating the two existing heat exchangers (condensers) into a new multistream one. This system is a heat recovery unit, which is used to cogenerate water and power. Two shell-and-tube condensers operate in a closed power cycle and a desalination system for cooling an ammonia mixture as a working fluid and condensing a pure vapor, respectively. Here, a two-phase flow multistream condenser is utilized instead of the two low-exergy-efficiency shell-and-tube condensers. The results proved that the proposed technique leads to improving its exergy efficiency by 15%. The performance of the proposed condenser was analyzed by applying parametric optimization. 相似文献