Embryo Survival on Day 25 of Generation in the Gilt is Not Affected by Exogenous Progesterone but is Correlated with Levels of Insulin-Like Growth Factor-I (IGF-I) mRNA in the Uterus

Yu, Z.,Gordon, J.R.,Kirkwood, R.N.,Thacker, P.A. Asian Australasian Association of Animal Productio 1999 Animal Bioscience Vol.12 No.6

The present study was undertaken to determine the effect of administration of exogenous progesterone early in gestation on uterine levels of IGF-I mRNA and on embryo survival at day 25 of gestation in the pig. Forty-one prepubertal gilts were induced into oestrus with PG600 and artificially inseminated at their subsequent naturally occurring oestrus. Gilts were then randomly assigned to one of three groups. Gilts in the two treatment groups were injected intramuscularly with 50 mg of progesterone either from day 2 to 14 (N=14) or from day 4 to 14 (N=15) after breeding while those in the control group (N=12) were given corn oil (0.5 ml) from day 2 to 14. Between days 25 and 28 of gestation, gilts were slaughtered and reproductive tracts were recovered. Endometrial tissue (1 g) was collected and analysed for IGF-I mRNA levels using a reverse transcription-polymerase chain reaction, Progesterone treatment, starting either on day 2 or 4 after breeding, neither significantly increased embryo survival rate by day 25 of gestation nor altered IGF-I mRNA levels in uterine tissue. However, across all samples, the IGF-I mRNA level in the uterus was highly correlated with embryo survival rate (r=0.8193, p<0.01), supporting the involvement of IGF-I in the regulation of porcine embryo development.

PREDICTION OF WEAR OF RUBBING BODIES ON THE BASE OF A THEORETICAL-INVARIANT METHOD

Drozdov, Yu. N.,Ignatieva, Z.V. ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 2000 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.2000 No.-

A theoretical-invariant method of friction units service life prediction is developed based on the combining some deterministic and probabilistic approaches to the problem of surface failure taking into consideration a number of mechanical, physico-chemical, thermal aspects of contact interaction of rubbing bodies.

Exchange coupling in ferromagnetic/antiferromagnetic/ferromagnetic [Pd/Co]_<i>n</i>/NiO/Co trilayers with different [Pd/Co] anisotropy

Yu, T.,Ning, X.K.,Liu, W.,Feng, J.N.,Kim, D.,Choi, C.J.,Zhang, Z.D. Elsevier 2015 Journal of magnetism and magnetic materials Vol.385 No.-

<P><B>Abstract</B></P> <P>Exchange coupling in NiO/Co bilayers and [Pd/Co(<I>t</I> <SUB> <I>Co</I> </SUB>)]<SUB> <I>n</I> </SUB>/NiO/Co trilayers prepared by magnetron sputtering has been investigated. With decreasing thickness (<I>t</I> <SUB> <I>Co</I> </SUB>) of the Co layers in [Pd/Co] multilayers (MLs) and increasing number of [Pd/Co] repeats (<I>n</I>), the ferromagnetic easy axis of the [Pd/Co] MLs switches from in-plane to out-of-plane direction. Ferromagnetic and non-collinear interlayer couplings between the [Pd/Co] MLs and the Co layer across the antiferromagnetic NiO spacer are found in trilayers. After cooling at in-plane and out-of-plane remanent state, respectively, for <I>t</I> <SUB> <I>Co</I> </SUB>=1nm and <I>n</I>=2, a larger in-plane exchange bias field of 724Oe is observed which vanishes at temperatures above 90K which is the same as the in-plane blocking temperature observed in the NiO/Co bilayer. For <I>t</I> <SUB> <I>Co</I> </SUB>=0.3nm and <I>n</I>=7, the in-plane blocking temperature in the trilayer enhances up to 210K, which strongly depends on orientation and strength of the ferromagnetic [Pd/Co] ML anisotropy axis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The easy axis of the [Pd/Co] MLs switches from in-plane to out-of-plane direction. </LI> <LI> Ferromagnetic and non-collinear interlayer couplings are found in the trilayers. </LI> <LI> A larger in-plane <I>H</I> <SUB> <I>E</I> </SUB> of 724Oe is observed for the trilayers <I>t</I> <SUB> <I>Co</I> </SUB>=1nm and <I>n</I>=2. </LI> <LI> The in-plane blocking temperature <I>T</I> <SUB> <I>B</I> </SUB> increases up to 210K for <I>t</I> <SUB> <I>Co</I> </SUB>=0.3nm and <I>n</I>=7. </LI> </UL> </P>

Real-space observation of a two-dimensional skyrmion crystal

Yu, X. Z.,Onose, Y.,Kanazawa, N.,Park, J. H.,Han, J. H.,Matsui, Y.,Nagaosa, N.,Tokura, Y. Macmillan Publishers Limited. All rights reserved 2010 Nature Vol.465 No.7300

Crystal order is not restricted to the periodic atomic array, but can also be found in electronic systems such as the Wigner crystal or in the form of orbital order, stripe order and magnetic order. In the case of magnetic order, spins align parallel to each other in ferromagnets and antiparallel in antiferromagnets. In other, less conventional, cases, spins can sometimes form highly nontrivial structures called spin textures. Among them is the unusual, topologically stable skyrmion spin texture, in which the spins point in all the directions wrapping a sphere. The skyrmion configuration in a magnetic solid is anticipated to produce unconventional spin??electronic phenomena such as the topological Hall effect. The crystallization of skyrmions as driven by thermal fluctuations has recently been confirmed in a narrow region of the temperature/magnetic field (T??B) phase diagram in neutron scattering studies of the three-dimensional helical magnets MnSi (ref. 17) and Fe<SUB>1−x</SUB>Co<SUB>x</SUB>Si (ref. 22). Here we report real-space imaging of a two-dimensional skyrmion lattice in a thin film of Fe<SUB>0.5</SUB>Co<SUB>0.5</SUB>Si using Lorentz transmission electron microscopy. With a magnetic field of 50??70 mT applied normal to the film, we observe skyrmions in the form of a hexagonal arrangement of swirling spin textures, with a lattice spacing of 90 nm. The related T??B phase diagram is found to be in good agreement with Monte Carlo simulations. In this two-dimensional case, the skyrmion crystal seems very stable and appears over a wide range of the phase diagram, including near zero temperature. Such a controlled nanometre-scale spin topology in a thin film may be useful in observing unconventional magneto-transport effects.

PHYSICAL-CHEMICAL PROPERTIES OF ETHANOL-DIESEL BLEND FUEL AND ITS EFFECT ON THE PERFORMANCE AND EMISSIONS OF A TURBOCHARGED DIESEL ENGINE

Z.-Q. CHEN,X.-X. MA,S.-T. YU,Y.-N. GUO,J.-S. LIU 한국자동차공학회 2009 International journal of automotive technology Vol.10 No.3

This paper deals with the main physical-chemical properties of ethanol-diesel blend and the effects of ethanoldiesel blends (up to 15% volume) on engine performance (full load torque vs. engine speed, BSEC vs. torque at 1400 r/min and 2300 r/min, and effect of start of injection angle) and emissions in ECE R49 tests (steady 13 points) using a 6.6 L inline 6-cylinder turbocharged direct injection diesel engine. The results show that an increase in ethanol fraction results in decreased viscosity of the blend fuel and very high distillation characteristics in the low temperature range. Solvents can improve the solubility of ethanol-diesel blends. The engine power was degraded proportional to the ethanol content (10% and 15%) due to the LHV (low heating value) of the blends. The higher latent heat of vaporization and lower CN (cetane number) of ethanol, which results from the steady state emissions of CO, HC, and SOF (soluble organic fraction), were much higher in the ECE R49 tests at low loads. Soot (solid mass) emissions were improved. The particulate matter emissions were significantly increased with higher blend volumes, and NOx emissions slightly increased with higher ethanol volumes. By increasing the injection angle properly, the performance parameters of the diesel engine were improved, but NOx emissions were deteriorated slightly. This paper deals with the main physical-chemical properties of ethanol-diesel blend and the effects of ethanoldiesel blends (up to 15% volume) on engine performance (full load torque vs. engine speed, BSEC vs. torque at 1400 r/min and 2300 r/min, and effect of start of injection angle) and emissions in ECE R49 tests (steady 13 points) using a 6.6 L inline 6-cylinder turbocharged direct injection diesel engine. The results show that an increase in ethanol fraction results in decreased viscosity of the blend fuel and very high distillation characteristics in the low temperature range. Solvents can improve the solubility of ethanol-diesel blends. The engine power was degraded proportional to the ethanol content (10% and 15%) due to the LHV (low heating value) of the blends. The higher latent heat of vaporization and lower CN (cetane number) of ethanol, which results from the steady state emissions of CO, HC, and SOF (soluble organic fraction), were much higher in the ECE R49 tests at low loads. Soot (solid mass) emissions were improved. The particulate matter emissions were significantly increased with higher blend volumes, and NOx emissions slightly increased with higher ethanol volumes. By increasing the injection angle properly, the performance parameters of the diesel engine were improved, but NOx emissions were deteriorated slightly.

Kinetics calculation of fast periodic pulsed reactors using MCNP6

Z. Zhong,Y. Gohar,A. Talamo,Y. Cao,I. Bolshinsky,Yu N. Pepelyshev,Alexander Vinogradov 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.7

Fast periodic pulsed reactor is a type of reactor in which the fission bursts are formed entirely withexternal reactivity modulation with a specified time periodicity. This type of reactors could generatemuch larger intensity of neutron beams for experimental use, compared with the steady state reactors. Inthe design of fast periodic pulsed reactors, the time dependent simulation of the power pulse is majorlybased on a point kinetic model, which is known to have limitations. A more accurate calculation methodis desired for the design analyses of fast periodic pulsed reactors. Monte Carlo computer code MCNP6 isused for this task due to its three dimensional transport capability with a continuous energy library. Some new routines were added to simulate the rotation of the movable reflector parts in the timedependent calculation. Fast periodic pulsed reactor IBR-2M was utilized to validate the new routines. This reactor is periodically in prompt supercritical state, which lasts for ~400 ms, during the equilibriumstate. This generates long neutron fission chains, which requires tremendously large amount ofcomputation time during Monte Carlo simulations. Russian Roulette was applied for these very longneutron chains in MCNP6 calculation, combined with other approaches to improve the efficiency of thesimulations. In the power pulse of the IBR-2M at equilibrium state, there is some discrepancy betweenthe experimental measurements and the calculated results using the point kinetics model. MCNP6 resultsmatches better the experimental measurements, which shows the merit of using MCNP6 calculationrelative to the point kinetics model.

Unambiguous Evidence for Existence of Antiferromagnetic Interlayer Coupling in Pt/Co Multilayers with Perpendicular Anisotropy

Z.Y. Liu,F. Zhang,N. Li,B. Xu,D.L. Yu,J.L. He,Y.J. Tian 한국자기학회 2008 한국자기학회 학술연구발표회 논문개요집 Vol.- No.-

Eu²⁺-doped Ba₂GaB₄O₉Cl blue-emitting phosphor with high color purity for near-UV-pumped white light-emitting diodes

Gao, Z.,Deng, H.,Xue, N.,Jeong, J.H.,Yu, R. Elsevier Advanced Technology 2018 OPTICS AND LASER TECHNOLOGY Vol.98 No.-

<P>Eu2+-doped borate fluoride Ba(2)GaB(4)O(9)C1 was synthesized by the conventional high-temperature solidstate reaction. The crystal structure and luminescence properties of the phosphors, as well as their thermal luminescence quenching capabilities and CIE chromaticity coordinates were systematically investigated. Under the excitation at 340 nm, the phosphor exhibited an asymmetric broad-band blue emission with a peak at 445 nm, which is ascribed to the 4f-5d transition of Eu2+. It was further proved that energy transfer among the nearest neighbor ions is the major mechanism for concentration quenching of Eu2+ in Ba-2,GaB(4)O(9)C1:xEu(2+) phosphors. The luminescence quenching temperature is 432 K. The CIE color coordinates are very close to those of BaMgA110017:Eu2+ (BAM). All the properties indicated that the blue emitting Ba(2)GaB(4)O(9)C1:Eu2+ phosphor has potential application in white LEDs. (C) 2017 Elsevier Ltd. All rights reserved.</P>

Improving the Magnetic Properties of FeSiB Soft Magnetic Composites by Adding Untreated or Phosphated Fe Powders

D. N. Chen,L. Huang,H. Y. Yu,X. C. Zhong,Z. W. Liu 한국자기학회 2019 Journal of Magnetics Vol.24 No.3

Soft magnetic composites (SMC) based on FeSiB amorphous alloys have been widely used in various electric devices. However, the amorphous powders are difficult to press, and the prepared cores exhibit low mechanical strength with high porosity. In this work, untreated and phosphated Fe powders with mean particle size of 70μm were added into FeSiB powders with mean size of less than 25μm to improve the performance of the SMC. The FeSiB/Fe SMCs are fabricated by cold pressing. The results show that the amplitude permeability of FeSiB/Fe SMCs increases with the increase of Fe content. However, the addition of untreated Fe powder leads to increased magnetic loss. On the contrary, the addition of phosphated iron powder can not only enhance the amplitude permeability but also effectively reduce the core loss. Hence, the addition of phosphated iron powder provides a good way to modify the soft magnetic properties of FeSiB/Fe SMC for AC application.

Spectroscopic properties of a novel garnet-type tellurate orange-red emitting Li3Gd3Te2O12:Sm3+ phosphor

Gao, Z.,Xue, N.,Jeong, J. H.,Yu, R. Springer Science + Business Media 2017 Journal of materials science. Materials in electro Vol.28 No.17