Mass detection using a macro-scale piezoelectric bimorph cantilever

2013 ◽  
Author(s):  
A. A. S. Rabih ◽  
J. O. Dennis ◽  
M. H. Md Khir ◽  
M. A. Abdullah
Keyword(s):  
Piezoelectric Bimorph ◽  
Mass Detection ◽  
Macro Scale

Macro and Nano Serially-Compounded Cantilevers for Resonance-Shift Mass Detection

2007 ◽  
Author(s):  
Nicolae Lobontiu ◽  
Iulian Lupea ◽  
Rob Ilic
Keyword(s):  
Analytical Model ◽  
Natural Frequencies ◽  
Displacement Sensor ◽  
Frequency Change ◽  
Mass Detection ◽  
Compliant Structure ◽  
Nano Scale ◽  
Resonance Shift ◽  
Element Simulation ◽  
Macro Scale

Detecting extraneous matter that deposits on a compliant receiver platform can be performed by means of the resonance shift method, whereby the original and altered natural frequencies of the host structure are compared to evaluate the amount and/or position of the attached matter. By scaling structural dimensions down to the nanometer range, it becomes possible to discern quantities in the molecular realm. One simple and convenient structural detector is the cantilever, whose out-of-the-plane resonant vibrations can be excited/monitored with relative ease. The proposed paper studies a few aspects of the mass attachment detection through monitoring of the natural frequency change of cantilevers, by focusing on the two ends of the dimensional spectrum: the macro- and nano-scale domains. The paper develops an analytical model that enables predicting the mass of attached matter in case its location is point-like and pre-specified. At nano-scale, locating mass attachment is realized through adequate surface functionalizing, while at macro-scale a displacement sensor can be placed conveniently on the compliant structure. The model accommodates cantilever configurations formed of several single-profile segments that are serially connected. Of all possible combinations, the two-segment, circularly-notched design is explicitly studied. Finite element simulation is utilized to check the analytical model validity. The bending natural frequencies of several macro-scale and nano-scale circularly-notched cantilever specimens have been investigated experimentally. Based on the agreement between analytical, numerical and experimental data, the analytical model was further utilized to study the relationships between geometric parameters, deposited mass, mass attachment position and the change in the bending resonant frequency.

Tailoring microstructures of materials through biomimetics

1993 ◽  
Vol 51 ◽  
pp. 500-501
Author(s):  
Mehmet Sarikaya ◽  
Ilhan A. Aksay
Keyword(s):  
Chemical Properties ◽  
Design And Synthesis ◽  
Structure Sensitive ◽  
Macro Scale ◽  
Methods Of Synthesis ◽  
Successive Level ◽  
Engineering Materials ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Synthesis Of Materials

Biomimetics involves investigation of structure, function, and methods of synthesis of biological composite materials. The goal is to apply this information to the design and synthesis of materials for engineering applications.Properties of engineering materials are structure sensitive through the whole spectrum of dimensions from nanometer to macro scale. The goal in designing and processing of technological materials, therefore, is to control microstructural evolution at each of these dimensions so as to achieve predictable physical and chemical properties. Control at each successive level of dimension, however, is a major challenge as is the retention of integrity between successive levels. Engineering materials are rarely fabricated to achieve more than a few of the desired properties and the synthesis techniques usually involve high temperature or low pressure conditions that are energy inefficient and environmentally damaging.In contrast to human-made materials, organisms synthesize composites whose intricate structures are more controlled at each scale and hierarchical order.

EFFECT OF THE MACRO-SCALE TOPOLOGY OVER THE EFFECTIVE DRAG COEFFICIENT IN DENSE GAS-SOLID FLUIDIZED FLOWS

2018 ◽  
Author(s):  
Seyed Reza Amini Niaki ◽  
Joseph Mouallem ◽  
Christian Milioli ◽  
Fernando Milioli
Keyword(s):  
Drag Coefficient ◽  
Dense Gas ◽  
Macro Scale

Underground waterlines

Focaal ◽  
2019 ◽  
pp. 1-14
Author(s):  
Denys Gorbach
Keyword(s):  
Macro Level ◽  
The Political ◽  
Macro Scale ◽  
Ethnographic Data ◽  
Economic Boom ◽  
Labor Hoarding ◽  
Large Enterprises

In order to explore factors conditioning the political quietude of Ukrainian labor, this article analyzes ethnographic data collected at two large enterprises: the Kyiv Metro and the privatized electricity supplier Kyivenergo. Focusing on a recent labor conflict, I unpack various contexts condensed in it. I analyze the hegemonic configuration developed in the early 1990s, at the workplace and at the macro level, and follow its later erosion. This configuration has been based on labor hoarding, distribution of nonwage resources, and patronage networks, featuring the foreman as the nodal figure. On the macro scale, it relied on the mediation by unions, supported by resources accumulated during the Soviet era and the economic boom of the 2000s. The depletion of these resources has spelled the ongoing crisis of this configuration.

Meso-Scale Experimental & Numerical Studies for Predicting Macro-scale Performance of Advanced Reactive Materials (ARMs)

2015 ◽  
Author(s):  
Naresh Thadhani ◽  
Arun Gokhale ◽  
Jason Quenneville ◽  
Jennifer Breidenich ◽  
Manny Gonzales ◽  
...  
Keyword(s):  
Reactive Materials ◽  
Numerical Studies ◽  
Macro Scale ◽  
Meso Scale

Design and Simulation of Piezoelectric Bimorph Cantilever Beam

2019 ◽  
Author(s):  
Nitesh Dixit ◽  
Amit Kumar Saraf ◽  
Dr. MP Singh
Keyword(s):  
Cantilever Beam ◽  
Piezoelectric Bimorph

Estimation of Regional Parameters in a Macro Scale Hydrological Model

2001 ◽  
Vol 32 (3) ◽  
pp. 161-180 ◽  
Author(s):  
Kolbjørn Engeland ◽  
Lars Gottschalk ◽  
Lena Tallaksen
Keyword(s):  
Additional Data ◽  
Hydrological Model ◽  
Sampling Methods ◽  
Probability Distributions ◽  
Repeated Application ◽  
Landscape Characteristics ◽  
Time Period ◽  
Macro Scale ◽  
Model Element ◽  
Regular Sampling

Macro-scale hydrological modelling implies a repeated application of a model within an area using regional parameters. These parameters are based on climate and landscape characteristics, and they are used to calculate the water balance in ungauged areas. The regional parameters ought to be robust and not too dependent of the catchment and time period used for calibration. The ECOMAG model is applied for the NOPEX-region as a macro-scale hydrological model distributed on a 2×2 km2 grid. Each model element is assigned parameters according to soil and vegetation classes. A Bayesian methodology is followed. An objective function describing the fit between observed and simulated values is used to describe the likelihood of the parameters. Using Baye's theorem these likelihoods are used to update the probability distributions of the parameters using additional data, being it either an additional year of streamflow or an additional streamflow station. Two sampling methods are used, regular sampling and Metropolis-Hastings sampling. The results show that regional parameters exist according to some predefined criteria. The probability distribution of the parameters shows a decreasing variance as data from new catchments are used for updating. A few parameters do, however, not exhibit this property, and they are therefore not suitable in a regional context.

Information in United States Patents on works related to ‘Natural Fibers’: 2000-2018

2019 ◽  
Vol 12 (1) ◽  
pp. 4-76 ◽  
Author(s):  
Krittirash Yorseng ◽  
Mavinkere R. Sanjay ◽  
Jiratti Tengsuthiwat ◽  
Harikrishnan Pulikkalparambil ◽  
Jyotishkumar Parameswaranpillai ◽  
...  
Keyword(s):  
United States ◽  
Composite Materials ◽  
Natural Fiber ◽  
Comprehensive Evaluation ◽  
Natural Fibers ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Macro Scale ◽  
Structural Applications

Background: This era has seen outstanding achievements in materials science through the advances in natural fiber-based composites. The new environmentally friendly and sustainability concerns have imposed the chemists, biologists, researchers, engineers, and scientists to discover the engineering and structural applications of natural fiber reinforced composites. Objective: To present a comprehensive evaluation of information from 2000 to 2018 in United States patents in the field of natural fibers and their composite materials. Methods: The patent data have been taken from the external links of US patents such as IFI CLAIMS Patent Services, USPTO, USPTO Assignment, Espacenet, Global Dossier, and Discuss. Results: The present world scenario demands the usage of natural fibers from agricultural and forest byproducts as a reinforcement material for fiber reinforced composites. Natural fibers can be easily extracted from plants and animals. Recently natural fiber in nanoscale is preferred over micro and macro scale fibers due to its superior thermo-mechanical properties. However, the choice of macro, micro, and nanofibers depends on their applications. Conclusion: This document presents a comprehensive evaluation of information from 2000 to 2018 in United States patents in the field of natural fibers and their composite materials.

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