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Artificial intelligence for fault diagnosis of rotating machinery: A review

Wavelets for fault diagnosis of rotary machines: A review with applications

Convolutional Neural Network Based Fault Detection for Rotating Machinery

This review covers advances in electrochemical and biochemical sensor development and usage during 2010 and 2011 In choosing scholarly articles to contribute to this review, special emphasis was placed on work published in the areas of reference electrodes, potentiometric sensors, voltammetric sensors, amperometric sensors, biosensors, immunosensors, and mass sensors In the past two years there have been a number of important papers, that do not fall into the general subsections contained within the larger sections Such novel advances are very important for the field of electrochemical sensors as they open up new avenues and methods for future research Each section above contains a subsection titled “Other Papers of Interest” that includes such articles and describes their importance to the field in general For example, while most electrochemical techniques for sensing analytes of interest are based on the changes in potential or current, Shan et al1 have developed a completely novel method for performing electrochemical measurements In their work, they report a method for imaging local electrochemical current using the optical signal of the electrode surface generated from a surface plasmon resonance (SPR) The electrochemical current image is based on the fact that the current density can be easily calculated from the local SPR signal The authors demonstrated this concept by imaging traces of TNT on a fingerprint on a gold substrate

Full articles and reviews were primarily amassed by searching the SciFinder Scholar and ISI Web of Knowledge Additional articles were found through alternate databases or by perusing analytical journals for pertinent publications Due to the reference limitation, only publications written in English were considered for inclusion Obviously, there have been more published accounts of groundbreaking work with electrochemical and biochemical sensors than those covered here This review is a small sampling of the available literature and not intended to cover every advance of the past two years The literature chosen focuses on new trends in materials, techniques, and clinically relevant applications of novel sensors To ensure proper coverage of these trends, theoretical publications and applications of previously reported sensor development were excluded

We want to remind our readers that this review is not intended to provide comprehensive coverage of electrochemical sensor development, but rather to provide a glimpse of the available depth of knowledge published in the past two years This review is meant to focus on novel methods and materials, with a particular focus on the increasing use of graphene sheets for sensor material development For readers seeking more information on the general principles behind electrochemical sensors and electrochemical methods, we recommend other sources with a broader scope2, 3 Electrochemical sensor research is continually providing new insights into a variety of fields and providing a breadth of relevant literature that is worthy of inclusion in this review Unfortunately, it is impossible to cover each publication and unintentional oversights are inevitable We sincerely apologize to the authors of electrochemical and biochemical sensor publications that were inadvertently overlooked

Electrochemical Sensors and Biosensors

Boron nitride nanotubes (BNNTs) possess extremely high stiffness and strength and may provide the ultimate reinforcing materials for the development of nanocomposites. In this paper, the Young’s modulus of BNNT based composites are evaluated using a 3-D nanoscale representative volume element based on continuum mechanics (CM) and using the finite element method (FEM). Additionally, the suitability of the BNNTs reinforced polymeric composites as nanomechanical resonators, using CM based approach and FEM is illustrated in this paper. Analytical formulas based on CM are used to examine the mass sensitivity of single walled BNNT (SWBNNT) reinforced composite considered as a thin wall BNNT for different aspect ratios and volume fractions of BNNT in composites. The FEM analysis, considering SWBNNT as a transversely anisotropic material is performed and results are compared with the CM based approach. The results indicated that the mass sensitivity of SWBNNT reinforced composite based nanomechanical resonators can reach 10−3 fg and a logarithmically linear relationship exists between the resonant frequency and the attached mass, when mass is larger than 10−3 fg. The simulation results which have been obtained based on FEM are found to be in good agreement with the analytical approach used in this paper.

Dynamic Analysis of Single Walled Boron Nitride Nanotube Reinforced Composite Based Nanomechanical Resonator

The present study is concerned with the linear and nonlinear transient motion analysis of a 2-lobe geometrically imperfect hybrid journal bearing system compensated with constant flow valve restric...

Dynamic analysis of a 2-lobe geometrically imperfect journal bearing system:

This article presents a numerical simulation of hydrodynamic journal bearing operating with non-Newtonian lubricant. The cubic shear stress fluid model has been used to describe the shear-thinning of lubricant in bearing clearance space. Finite element formulation is used to perform a numerical simulation of the bearing system. The bearing performance parameters, namely film pressure distribution, min. film thickness, film frictional torque, film rotor-dynamic coefficient, etc., are computed for a wide range of external load and fluid nonlinearity index. It has been found that the shear-thinning of lubricant significantly reduces (−31.88%) the minimum film thickness in a journal bearing. However, a substantial enhancement has been observed in most of the direct rotor-dynamic coefficients due to the shear-thinning of the lubricant.

Performance of Hydrodynamic Journal Bearing Operating with Shear-Thinning Lubricants

The generation of microwave second harmonic and sum and difference frequency has been investigated analytically when two microwaves of frequencies ω 1 and ω 2 are incident normally on a semiconducting slab in the presence of a d.c. field. The analysis takes into account acoustic phonon scattering as well as ionized impurity scattering of electrons. For a typical case of germanium slab the amplitudes of reflected and transmitted components of second harmonic waves are 8.8% and 5.4% respectively of that of the fundamental wave.

Generation of Microwave Second Harmonic and Sum and Difference Frequency in Semiconductors at Low Temperatures

An analytical investigation of the thermoelectric effect of hot carriers in semiconductors with non‐parabolic energy bands and spherical energy surfaces has been carried out. The analysis is good for moderately high intensities of the applied electric field. Some numerical results, particularly applicable to indium arsenide and indium antimonide, are presented at the end.

Satish C. Sharma

Papers

Dynamic Analysis of Single Walled Boron Nitride Nanotube Reinforced Composite Based Nanomechanical Resonator

Dynamic analysis of a 2-lobe geometrically imperfect journal bearing system:

Performance of Hydrodynamic Journal Bearing Operating with Shear-Thinning Lubricants

Generation of Microwave Second Harmonic and Sum and Difference Frequency in Semiconductors at Low Temperatures

Thermoelectric Effect of Hot Carriers in Semiconductors with Nonparabolic Energy Bands