http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Torsion modulus using the technique of mechanical spectroscopy in biomaterials
Carlos Alberto Fonzar Pintão,Diego R. N. Correa,Carlos R. Grandini 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.5
This work presents a new alternative to studying and determining the shear or torsion modulus, G. For this purpose, a measuring system was constructed with a rotational motion sensor coupled to a torsion pendulum that allowed the determination of the angular position as a function of time. Through an equation derived from studies of mechanical spectroscopy and the theory of relaxation of materials, G was calculated, and experiments were focused on validating it. The advantage of this technique, compared to other dynamical methods, is that it is not necessary to know the Poisson's ratio of the sample.
Measurement of the rotational inertia of bodies by using mechanical spectroscopy
Carlos Alberto Fonzar Pintão 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10
In this paper, mechanical spectroscopy was used to study the rotational inertia of bodies. In order to verify and show its importance inrelation to other techniques, measurements of the internal friction and rotational inertia of a body with liquid or sand inside were carriedout. For a solid without axes and planes of symmetry, properties such as the matrix, directions and principal moments of inertia, variationof the rotational inertia for each of the coordinate planes, and the ellipsoid of inertia were determined. Force sensors and rotational motionwere used in the measurements taken in an arrangement that was specifically designed for this type of measure.
A new approach to measure the elasticity modulus for ceramics using the deformation energy method
Cesar R. Foschini,Edson A. C. Souza,Ana F. S. Borges,Carlos A. F. Pintão 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.8
This paper presents an alternative method to measure the modulus of elasticity to traction, E, for relatively limited sample sizes. We constructed a measurement system with a Force sensor (FS) and a Rotation movement sensor (RMS) to obtain a relationship between force (F) and bending (ΔL). It was possible by calculating the strain energy and the work of a constant force to establish a relationship between these quantities; the constant of proportionality in this relationship depends on E, I and L. I and L are the moment of inertia of the uniform cross-section in relation to an oriented axis and length, respectively, of the sample for bending. An expression that could achieve the value of E was deduced to study samples of Y-TZP ceramics. The advantages of this system compared to traditional systems are its low cost and practicality in determining E.
Zhang, Xiaobo,Pint, Cary L.,Lee, Min Hyung,Schubert, Bryan Edward,Jamshidi, Arash,Takei, Kuniharu,Ko, Hyunhyub,Gillies, Andrew,Bardhan, Rizia,Urban, Jeffrey J.,Wu, Ming,Fearing, Ronald,Javey, Ali American Chemical Society 2011 NANO LETTERS Vol.11 No.8
<P>A simple approach is described to fabricate reversible, thermally- and optically responsive actuators utilizing composites of poly(<I>N</I>-isopropylacrylamide) (pNIPAM) loaded with single-walled carbon nanotubes. With nanotube loading at concentrations of 0.75 mg/mL, we demonstrate up to 5 times enhancement to the thermal response time of the nanotube-pNIPAM hydrogel actuators caused by the enhanced mass transport of water molecules. Additionally, we demonstrate the ability to obtain ultrafast near-infrared optical response in nanotube-pNIPAM hydrogels under laser excitation enabled by the strong absorption properties of nanotubes. The work opens the framework to design complex and programmable self-folding materials, such as cubes and flowers, with advanced built-in features, including tunable response time as determined by the nanotube loading.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2011/nalefd.2011.11.issue-8/nl201503e/production/images/medium/nl-2011-01503e_0002.gif'></P>
A DIOPHANTINE PROBLEM CONCERNING POLYGONAL NUMBERS
KIM, DAEYEOUL,PARK, YOON KYUNG,PINTÉ,R, Á,KOS Cambridge University Press 2013 Bulletin of the Australian Mathematical Society Vol.88 No.2
<B>Abstract</B><P>Motivated by some earlier Diophantine works on triangular numbers by Ljunggren and Cassels, we consider similar problems for general polygonal numbers.</P>