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Producing Alkaline Lipase by Fusarium oxysporum Using Unconventional Medium Components
Cedenir Pereira de Quadros,Juliano Lemos Bicas,Iramaia Angelica Neri-Numa,Glaucia Maria Pastore 한국식품과학회 2009 Food Science and Biotechnology Vol.18 No.6
This study reports the use of different inducing agents (olive, soybean, and used frying oils) and culture mediums [synthetic medium (SM), whey protein, and corn steep liqueur (SL)] to optimize the production of lipase by Fusarium oxysporum. A relationship among the inoculum size, presence of a fat source, fungal growth, and lipase production was evident during the fermentation. The best results were achieved when the inoculum was grown in SM or SL and the fermentation was developed in SM with frying oil as the inducing agent. The maximum activity (about 15 U/㎖) was obtained after a 72 hr cultivation.
Physical characteristics of magnetorheological suspensions and their applications
Bica, I.,Liu, Y.D.,Choi, H.J. Korean Society of Industrial and Engineering Chemi 2013 Journal of industrial and engineering chemistry Vol.19 No.2
This paper reviews the potential applications of magnetorheological suspensions along with their rheological and electro-conductive properties under an applied magnetic field. Linked to these physical properties, the range of potential engineering applications of their linear and revolving vibrations include shock absorbers, dampers, clutches, magneto-resistors, magnetic field sensors and ultrafine polishing technology. Improvements in the electrical characteristics of steady current generators, rotary dampers under high and low pressures, kineto-therapeutic devices and medical applications are also covered.
Local softening of hard shelled semiproducts by using a plasma generator
Bica, Ioan The Korean Welding and Joining Society 1996 대한용접·접합학회지 Vol.14 No.3
The work presents the experimental results concerning the local softening of Diesel motor cylinders with plasma using a specialized plasma generator.
Bica, Ioan,Anitas, Eugen M,Lu, Qi,Choi, Hyoung Jin Institute of Physics Publishing 2018 Smart materials & structures Vol.27 No.9
<P>Smart membranes based on an absorbent cloth microfiber material and silicone oil were prepared using a fixed volume concentration of carbonyl iron and various volume concentrations of <img ALIGN='MIDDLE' ALT='$\gamma \mbox{-} {\rm{F}}{{\rm{e}}}_{2}{{\rm{O}}}_{3}$' SRC='http://ej.iop.org/images/0964-1726/27/9/095021/smsaad5a6ieqn1.gif'/> additive nanoparticles. The membranes were then used to manufacture magnetoresistors, whose resistance was measured under an applied magnetic field with a magnetic flux density up to 250 mT. The electrical conductivity and viscosity of the membranes increased with increasing magnetic field intensity, while at a fixed magnetic field strength, the electrical conductivity and viscosity decreased with increasing <img ALIGN='MIDDLE' ALT='$\gamma \mbox{-} {\rm{F}}{{\rm{e}}}_{2}{{\rm{O}}}_{3}$' SRC='http://ej.iop.org/images/0964-1726/27/9/095021/smsaad5a6ieqn2.gif'/> concentration. A theoretical model to explain these results was developed further in the framework of a dipolar approximation.</P>
Magnetodielectric effects in hybrid magnetorheological suspensions based on beekeeping products
I. Bica,E.M. Anitas 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Electrical capacitors (EC) are manufactured having environmental-friendly and cost-effective bioactivehybrid magnetorheological suspensions (hMRSs) as dielectric material. hMRSs are prepared by soaking acotton fabric with a liquid solution based on honey bee (HB), wax and various concentrations of carbonyliron (CI) microparticles. We investigate the response of EC to a static magneticfield with and without anelectricfield, and to time-periodic magneticfields. We show that the induced magnetodielectricproperties are sensibly influenced by concentration of CI, and are comparable to those of MRSs based onchemically synthesized components.
Ioan Bica 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
Two sets, each of five samples, of magnetorheological elastomers (MREs) based on silicone rubber and carbonyl iron were prepared. One set of samples was obtained by polymerization of the silicone rubber with additives in the absence of the magnetic field, while the other by polymerization of the silicone rubber with additives in the presence of the magnetic field (840 kA/m). The samples from each set differ by volume concentration of the magnetic phase. By means of an experimental setup described in the paper, the electrical resistance R of the samples was measured as a function of the force F applied on the surface of the samples, for fixed values of the transverse magnetic field strength H. From the as-measured dependence R = R(F)H, the dependence s = s(p)H of the electric conductivity s on the applied pressure p was determined. The experimental results are discussed in view of possible applications like magnetomechanical sensors working in hostile media.
Ioan Bica 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
This paper deals with the process of achievement of anisotropic magnetorheological elastomers (MREs),based on silicone rubber and iron nanoparticles. Plane capacitors are manufactured with MREs. The capacity C of the plane capacitors is measured as function of the intensity H of the magnetic field. By using the approximation of the dipolar magnetic moment and the ideal elastic body model, respectively, the tensions and deformations field and respectively the elasticity module of MREs function of H have been determined, for magnetic field values of up to 1000 kA/m. The obtained results are presented and discussed.
Magnetoresistor sensor with magnetorheological elastomers
Ioan Bica 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.1
The paper presents the manner of achieving and testing a magnetoresistor sensor with magnetorheological elastomers. It is shown that the voltage at the output terminals of themagnetorheological sensor device is considerably influenced by the intensity of the transverse magnetic field, for control voltages kept constant. The experimental results obtained are presented and discussed.
Magnetostrictive and viscoelastic characteristics of polyurethane-based magnetorheological elastomer
Ioan Bica,Eugen M. Anitas,Larisa Marina Elisabeth Averis,권승혁,최형진 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.73 No.-
We fabricated magnetorheological (MR) elastomers using polyurethane and carbonyl iron based MRsuspensions. Using dipolar approximation and linear elasticity theory for small deformations, wedetermined their components of deformations and tensions, showing that their elasticity state dependsnot only on magneticfield intensity but also on volume fraction. MR characteristics of elastomers’dynamic properties and creep-recovery values were also measured using a rotational rheometerequipped with a magneticfield supplier. Experimental results from both plane capacitors and viscoelastictests showed similarities between static and dynamic elasticity states regarding their dependence onmagneticfield intensity and volume fraction of magnetizable phase.