The Experiment Research on the Fluid Magnetic Abrasives

2012 ◽  
Vol 522 ◽  
pp. 3-7
Author(s):  
Wei Dong Li ◽  
Ming Lv
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Rheological Property ◽  
Strong Magnetic Field ◽  
Micro Structure ◽  
Experiment Research ◽  
Intelligent Material ◽  
New Type ◽  
Magnetic Abrasives

The fluid magnetic abrasive (FMA) is a new type of intelligent material. The fluid magnetic abrasive (FMA) has typical liquid characteristics, when there is no external magnetic field around it. But when a strong magnetic field is applied, the viscosity of it will increase more than 100 times within a few milliseconds, and it will show the characteristics those are resemble to solid's. We call this feature as rheological property, of which because the workpiece can be finished by fluid magnetic abrasive (FMA). On base of researching on the micro-structure of fluid magnetic abrasive (FMA), the experiments and results are presented in this paper.

Research on the Finishing Mechanism of Fluid Magnetic Abrasives

2010 ◽  
Vol 455 ◽  
pp. 211-215 ◽  
Author(s):  
H. Zhang ◽  
W.D. Li
Keyword(s):  
Rheological Property ◽  
Micro Structure ◽  
New Type ◽  
Precision Finishing ◽  
Magnetic Abrasives

The fluid magnetic abrasive (FMA) is a new type of precision finishing abrasives. The workpiece can be finished by fluid magnetic abrasive (FMA) because of its rheological property. On base of researching on the micro-structure of fluid magnetic abrasive (FMA), this paper analyzed the finishing mechanism. And the experiments and results are presented as well in this paper.

Study of the Performance of Practical Magneto-Rheological Elastomers

2012 ◽  
Vol 430-432 ◽  
pp. 1979-1983
Author(s):  
Wei Bang Feng ◽  
Xue Yang ◽  
Zhi Qiang Lv
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Mechanical Property ◽  
Magnetic Properties ◽  
External Magnetic Field ◽  
Magnetic Particles ◽  
Poor Performance ◽  
Electrical And Magnetic Properties ◽  
Intelligent Material ◽  
Magneto Rheological

Magneto-rheological elastomer( MR elastomer) is an emerging intelligent material made up of macromolecule polymer and magnetic particles. While a promising wide application it has in the fields of warships vibration controlling for its controllable mechanical, electrical and magnetic properties by external magnetic field, design and application of devices based on it are facing great limitations imposed by its poor performance in mechanical properties and magneto effect. Aiming at developing a practical MR elastomer, a new confecting method was proposed in this paper. Then, following this new method and using a specificly designed solidifying matrix, an amido- polyester MR elastomer was developed with its mechanical property systemically explored.

Development of a Novel Vibrating Sample Magnetometer

2007 ◽  
Vol 537-538 ◽  
pp. 413-418 ◽  
Author(s):  
István Mészáros
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
External Magnetic Field ◽  
Materials Science ◽  
Science Laboratory ◽  
Vibrating Sample Magnetometer ◽  
Hard Magnetic Materials ◽  
Measuring Device ◽  
Parallel Motion ◽  
New Type

A new type of vibrating sample magnetometer (VSM) was designed for measuring the magnetic properties of soft and hard magnetic materials is described. The developed instrument differs from the traditional Foner type because in our system the motion of the specimen is parallel with the lines of the external magnetic field. Therefore, this instrument can be called parallel motion vibrating sample magnetometer (PMVSM). The special vibrating system contains a vibrating rod which holds the specimen. This arrangement can make the sample replacement and positioning fast and convenient. Because of the versatility of the PMVSM instrument it could be a useful measuring device for materials science laboratory and educational purposes as well.

scholarly journals An X-ray surprise in a magnetic pulsator

2014 ◽  
Vol 9 (S307) ◽  
pp. 455-456
Author(s):  
Yaël Nazé
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Stellar Winds ◽  
X Ray ◽  
Object A ◽  
New Type

Abstractξ1 CMa is a rare β Cep star with a strong magnetic field. To gain new insight on this object, a dedicated campaign using XMM-Newton was performed. These data reveal a new type of variations, X-ray pulsations, posing a new challenge to our understanding of stellar winds.

The roller chain lubricated with ferrofluids

2018 ◽  
Vol 233 (6) ◽  
pp. 927-935
Author(s):  
Yanjuan Zhang ◽  
Zhengqing Yang ◽  
Decai Li
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Service Life ◽  
Chain Structure ◽  
Lubricating Oil ◽  
Roller Chain ◽  
New Type ◽  
Chain Transmission ◽  
Novel Method ◽  
The Magnetic Field

The sleeve of roller chain periodically squeezes the pin during the process of chain transmission. The lubrication oil located in the gap of the sleeve and pin will be pushed out and cannot be restored automatically. The absence of sufficient lubricating oil can cause friction, wear, and even the roller chain failure between the pin and the sleeve. This article presents a novel method and a new type of chain structure to lubricant roller chain with ferrofluids, which is capable of prolonging the service life of roller chain. The results show that ferrofluids can be remained in the clearance between the sleeve and the pin shaft under the effect of external magnetic field. The ferrofluids that were squeezed out of the clearance can be restored automatically, which ensure the reliability of chain transmission. And the external magnetic field effectively prevents the chain lubrication leakage due to the edge effect of the magnetic field.

Internal structure modification and decay of hadrons in strong magnetic field

2015 ◽  
Vol 39 ◽  
pp. 1560114
Author(s):  
Peter Filip
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
External Magnetic Field ◽  
Internal Structure ◽  
Strong Magnetic Field ◽  
Structure Modification ◽  
Decay Channels ◽  
Enhanced Production ◽  
Decay Products ◽  
Sufficient Strength

We discuss the influence of external magnetic field on strong decays of [Formula: see text], [Formula: see text] and [Formula: see text] mesons. Due to increasing energy of [Formula: see text] Landau level of charged decay products, particular decay channels may become suppressed and isospin rules for strong decays can be violated. In the case of [Formula: see text] meson, enhanced production of photons and dileptons (with modified invariant mass) may occur. Similar considerations are applied to decays of [Formula: see text] baryon. We also suggest that static electromagnetic field of sufficient strength can modify the internal structure (wavefunction) of [Formula: see text] J/[Formula: see text] and [Formula: see text] mesons, and specific decay channels (e.g. CP — violating [Formula: see text]) can become enhanced.

Study on the Rheological Effect Models of Fluid Magnetic Abrasive

2009 ◽  
Vol 416 ◽  
pp. 54-60
Author(s):  
Huan Wu Sun ◽  
Shi Chun Yang
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Surface Roughness ◽  
Experimental Results ◽  
Transition Phenomenon ◽  
New Type ◽  
Rheological Effect ◽  
First Time ◽  
Precision Finishing ◽  
Magnetic Abrasives

The fluid magnetic abrasives (FMA) are a new type of precision finishing abrasives which are developed on the basis of the phase transition phenomenon caused by magnetic field. The rheological effect of FMA is the basis to achieve its finishing function, and has a great impact on the finishing capabilities and the final surface roughness. In order to get a better understanding of FMA finishing mechanism, the rheological effect models of FMA are deduced for the first time, the simulations and the experimental results are discussed as well in this paper.

Interaction of External Acoustic Waves - Confined Electrons - Internal Phonons in a Cylindrical Quantum Wire with an Infinite Potential in the Presence of an External Magnetic Field

2018 ◽  
Vol 783 ◽  
pp. 62-72
Author(s):  
Nguyen Vu Nhan ◽  
Nguyen Van Nghia ◽  
Nguyen Quyet Thang ◽  
Nguyen Quang Bau
Keyword(s):  
Magnetic Field ◽  
Kinetic Equation ◽  
External Magnetic Field ◽  
Quantum Wells ◽  
Strong Magnetic Field ◽  
Acoustic Waves ◽  
Quantum Wire ◽  
Heisenberg Equation ◽  
Quantum Kinetic Equation ◽  
System Temperature

Interaction of external acoustic waves - confined electrons - internal phonons in a cylindrical quantum wire with an infinite potential (CQWIP) has been theoretically studied via the quantum kinetic equation for electrons in the presence of an external magnetic field (EMF). The quantum kinetic equation for the distribution function of electrons interacting with internal and external acoustic phonons is obtained from the Heisenberg equation of motion and the model of CQWIP. The density of acoustomagnetoelectric (AME) current and the analytical expressions for the AME field in the CQWIP in the presence of the EMF are obtained. The theoretical results are numerically evaluated for the specific CQWIP of GaAs/GaAsAl. It is shown that the AME field strongly depends on the system temperature in both cases of the strong magnetic field and the weak magnetic field. However, the graph showing the relationship between the AME field and the system temperature has the peaks in case of the strong magnetic field. The reason may be due to movement of the electrons between the mini-bands. The AME field obtained in this work are then compared with those of bulk semiconductors, superlattices, quantum wells (QW) and rectangular quantum wire (RQW).

scholarly journals Deconfinement of heavy quarks at finite density and strong magnetic field

2020 ◽  
Vol 229 (22-23) ◽  
pp. 3387-3394
Author(s):  
Michał Szymański
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Heavy Quark ◽  
Critical Point ◽  
Strong Magnetic Field ◽  
Chemical Potential ◽  
Heavy Quarks ◽  
Polyakov Loop ◽  
Finite Density ◽  
Simultaneous Effect

AbstractWe study the simultaneous effect of the external magnetic field and finite chemical potential on deconfinement of heavy quarks, probed by the Polyakov loop and its fluctuations. We calculate the Polyakov loop, its real and imaginary susceptibilities, their ratio, as well as the heavy quark and anti-quark entropies. We find that these quantities are sensitive probes of deconfinement. Especially, the real Polyakov loop susceptibility and heavy quark and anti-quark entropies diverge at the critical point.

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