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Articles 1 - 7 of 7
Full-Text Articles in Mechanical Engineering
Sputtering Power Effects On Growth And Mechanical Properties Of Cr2alc Max Phase Coatings, Muhammad Naveed, Aleksei Obrosov, Andrzej Zak, Wlodzimierz Dudzinski, Alex A. Volinsky, Sabine Weiß
Sputtering Power Effects On Growth And Mechanical Properties Of Cr2alc Max Phase Coatings, Muhammad Naveed, Aleksei Obrosov, Andrzej Zak, Wlodzimierz Dudzinski, Alex A. Volinsky, Sabine Weiß
Mechanical Engineering Faculty Publications
Coating growth and mechanical properties of nanolamellar Cr2AlC coatings at various sputtering power were investigated in the present study. Cr2AlC coating was deposited on the IN 718 superalloy and (100) Si wafers by DC magnetron sputtering at different sputtering powers. The structure and properties were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nanoindentation. It was found that coatings had columnar structure with nanocrystalline substructure. Deposition rate increased with the sputtering power. XRD results showed the presence of the Cr2AlC MAX phase, intermetallic AlCr2 and Cr7 …
Eigenstress Model For Electrochemistry Of Solid Surfaces, Hongxin Ma, Xilin Xiong, Panpan Gao, Xi Li, Yu Yan, Alex A. Volinsky, Yanjing Su
Eigenstress Model For Electrochemistry Of Solid Surfaces, Hongxin Ma, Xilin Xiong, Panpan Gao, Xi Li, Yu Yan, Alex A. Volinsky, Yanjing Su
Mechanical Engineering Faculty Publications
Thermodynamic analysis and molecular dynamics simulations were conducted to systematically study the size-dependent electrochemical response of solids. By combining the generalized Young-Laplace equation with the popular Butler-Volmer formulation, the direct influence of surface stress on solid film electrochemical reactions was isolated. A series of thermodynamic formulas were developed to describe the size-dependent electrochemical properties of the solid surface. These formulas include intrinsic surface elastic parameters, such as surface eigenstress and surface elastic modulus. Metallic films of Au, Pt, Ni, Cu and Fe were studied as examples. The anodic current density of the metal film increased, while the equilibrium potential decreased …
Dynamic Recrystallization Behavior And Processing Map Of The Cu–Cr–Zr–Nd Alloy, Yi Zhang, Huili Sun, Alex A. Volinsky, Baohong Tian, Kexing Song, Zhe Chai, Ping Liu, Yong Liu
Dynamic Recrystallization Behavior And Processing Map Of The Cu–Cr–Zr–Nd Alloy, Yi Zhang, Huili Sun, Alex A. Volinsky, Baohong Tian, Kexing Song, Zhe Chai, Ping Liu, Yong Liu
Mechanical Engineering Faculty Publications
Hot deformation behavior of the Cu–Cr–Zr–Nd alloy was studied by hot compressive tests in the temperature range of 650–950 °C and the strain rate range of 0.001–10 s−1 using Gleeble-1500D thermo-mechanical simulator. The results showed that the flow stress is strongly dependent on the deformation temperature and the strain rate. With the increase of temperature or the decrease of strain rate, the flow stress significantly decreases. Hot activation energy of the alloy is about 404.84 kJ/mol and the constitutive equation of the alloy based on the hyperbolic-sine equation was established. Based on the dynamic material model, the processing map …
On Event-Triggered Adaptive Architectures For Decentralized And Distributed Control Of Large-Scale Modular Systems, Ali Albattat, Benjamin C. Gruenwald, Tansel Yucelen
On Event-Triggered Adaptive Architectures For Decentralized And Distributed Control Of Large-Scale Modular Systems, Ali Albattat, Benjamin C. Gruenwald, Tansel Yucelen
Mechanical Engineering Faculty Publications
The last decade has witnessed an increased interest in physical systems controlled over wireless networks (networked control systems). These systems allow the computation of control signals via processors that are not attached to the physical systems, and the feedback loops are closed over wireless networks. The contribution of this paper is to design and analyze event-triggered decentralized and distributed adaptive control architectures for uncertain networked large-scale modular systems; that is, systems consist of physically-interconnected modules controlled over wireless networks. Specifically, the proposed adaptive architectures guarantee overall system stability while reducing wireless network utilization and achieving a given system performance in …
Functional Performance Differences Between The Genium And C-Leg Prosthetic Knees And Intact Knees, Michael J. Highsmith, Jason T. Kahle, Rebecca M. Miro, M. E. Cress, Derek J. Lura, William S. Quillen, Stephanie Carey, Rajiv V. Dubey, Larry J. Mengelkoch
Functional Performance Differences Between The Genium And C-Leg Prosthetic Knees And Intact Knees, Michael J. Highsmith, Jason T. Kahle, Rebecca M. Miro, M. E. Cress, Derek J. Lura, William S. Quillen, Stephanie Carey, Rajiv V. Dubey, Larry J. Mengelkoch
Mechanical Engineering Faculty Publications
Microprocessor prosthetic knees (MPKs) have advanced technologically, offering new features to decrease impairment and activity limitations for persons with transfemoral amputation (TFA). The Genium knee is functionally untested, and functional differences between it and intact knees are unknown. This study sought to determine whether Genium use improves functional performance compared with the C-Leg. A randomized experimental crossover design was used, with a cross-section of five nonamputee controls for comparison to normal. Twenty community-ambulating persons with TFA were trained and tested for accommodation with study components. All subjects (n = 25) were assessed using the Continuous-Scale Physical Functional Performance-10 (CS-PFP10) …
Microfocusing At The Pg1 Beamline At Flash, S. Dziarzhytski, N. Gerasimova, Rene Goderich, T. Mey, M. Rübhausen, F. Siewert, H. Weigelt, G. Brenner
Microfocusing At The Pg1 Beamline At Flash, S. Dziarzhytski, N. Gerasimova, Rene Goderich, T. Mey, M. Rübhausen, F. Siewert, H. Weigelt, G. Brenner
Mechanical Engineering Faculty Publications
The Kirkpatrick-Baez (KB) refocusing mirror system installed at the PG1 branch of the plane-grating monochromator beamline at the soft X-ray/XUV free-electron laser in Hamburg (FLASH) is designed to provide tight aberration-free focusing down to 4 µm × 6 µm full width at half-maximum (FWHM) on the sample. Such a focal spot size is mandatory to achieve ultimate resolution and to guarantee best performance of the vacuum-ultraviolet (VUV) off-axis parabolic double-monochromator Raman spectrometer permanently installed at the PG1 beamline as an experimental end-station. The vertical beam size on the sample of the Raman spectrometer, which operates without entrance slit, defines and …
User Involvement In The Partner Program Of The Educational Social Network, Ilya V. Osipov, Alex A. Volinsky, Anna Y. Praskikova
User Involvement In The Partner Program Of The Educational Social Network, Ilya V. Osipov, Alex A. Volinsky, Anna Y. Praskikova
Mechanical Engineering Faculty Publications
The paper describes experiments to attract active online system users to the partner program. The objective is to grow the number of users by involving existing system users in viral mechanics. Several examples of user motivation are given, along with the specific interface implementations and viral mechanics. Viral K-factor was used as the metrics for the resulting system growth assessment. Specific examples show both positive and negative outcomes. Growth of the target system parameters is discussed.