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排序方式: 共有2605条查询结果,搜索用时 15 毫秒
31.
Min-Jae Yoon Yoan-Sang Bae Sang-Ha Son Jae-Wook Lee Chang-Ha Lee 《Korean Journal of Chemical Engineering》2007,24(5):877-880
Luminescent yttrium aluminum garnet (YAG, Y3Al5O12) nanoparticles doped with Eu (10 at%) were synthesized in batch-type and continuous-type supercritical water (SCW) reactors.
In the case of the continuous-type SCW method, the particles of YAG: Eu phosphors were much smaller and demonstrated a uniform
spherical-like shape. Inversely, in the case of the batch-type SCW method, a needle-like or elliptical-like shape was formed
because a finite amount of time was required to reach SCW conditions from ambient conditions. However, the emission intensity
of YAG: Eu phosphors synthesized by using the batch-type SCW method was stronger. Therefore, it is concluded that the continuous-type
SCW method is superior to the batch-type SCW method from the viewpoint of the particle size and shape, but the luminescence
property of phosphors in the continuous-type SCW method needs to be improved. In addition, a calcination process slightly
improved the luminescence intensities of YAG: Eu phosphors generated by using either the batch-type or continuous-type SCW
methods. 相似文献
32.
Sang Chul Seo Hyun Jung Kim Byung Ho Park Kwang Suk Son Sung Keun Lee Sun Bae Kang Donggyu Kim 《Metals and Materials International》2006,12(3):273-277
In a continuous casting steelmaking operation, the surface of a slab is under a condition that can be characterized as high-temperature,
low-cycle fatigue in which the tensile and compressive stress is repeatedly developed. For this reason, for the evaluation
of the hot ductility of a slab, considering the fatigue deformation is more feasible before a tensile or compressive test.
In this study, the effects of low-cycle fatigue on the hot ductility of steels with a carbon content of 0.06–0.8 wt.% are
investigated at various temperatures. For a carbon content of 0.06%, there were no significant differences between the RA
values from a simple tensile test and those from a tensile test after fatigue deformation. The tendency of ductility deterioration
with fatigue deformation is evident in 0.1 %C steel, and is due to the deformation-induced ferrite film that forms around
the prior austenite grain. Conversely, high carbon steel containing 0.8 %C did not show a recovery of hot ductility in a low
temperature region, and the specimen on which the tensile was measured after fatigue showed a higher hot ductility in the
low temperature region, which is thought to result from the pearlite refinement effects. As the results obtained in this work
showed noticeable differences in the hot ductility of carbon steel through the test conditions, it is suggested that for more
accurate data, fatigue deformation be adopted in which the temperature range in an unbending operation is determined in the
steelmaking factory. 相似文献
33.
Il Song Park Tae Gyu Woo Min Ho Lee Seung Geun Ahn Myung Sik Park Tae Sung Bae Kyeong Won Seol 《Metals and Materials International》2006,12(6):505-511
Anodic oxidation is the process of creating a titanium oxide layer with various defects more dense and stable. In this study,
a dense, stable and porous oxide layer was formed using anodic spark oxidation on pure titanium surface and hydroxyapatite
crystals were formed on its surface via a hydrothermal treatment. A mixture of 0.02M−GP (Glycerolphosphate disodium salt)
and 0.2M-CA (Calcium acetate) was used as an electrolyte. By increasing the anodizing voltage to 220, 260, 300, and 360 V,
the effects of the anodizing voltage were examined by evaluating the film properties after anodization and a hydrothermal
treatment. Breakdown occurred around 230 V. As the voltage increased after breakdown, the pore size increased. After the hydrothermal
treatment, the amount of HA crystal precipitation was also increased as the voltage increased. The mean surface roughness
(Ra) of the anodizing surface was also increased as the voltage increased. The Ra value was larger in the hydrothermally treated
group compared with the group treated with anodization as a result of the HA crystals present on the surface after the hydrothermal
treatment. Corrosion resistance of the surface modified by anodization was significantly increased in a saline solution compared
to that for the non-treated group; this increased further after the hydrothermal treatment. These increases were most likely
due to a thick stable oxide layer formed through anodization. Thus, it is believed that titanium with its surface modified
through anodic spark oxidation would be a suitable biomaterial due to its corrosion resistance and biocompatibility. 相似文献
34.
H.?H.?ParkEmail author M.?H.?Lee J.?S.?Yoon I.?S.?Bae B.?I.?Kim 《Metals and Materials International》2003,9(3):311-317
STS310S and SC-STS310S (simultaneously co-deposited chromium and aluminum onto 310S austenitic stainless steel substrate by
pack-cementation process) were used as separator materials on the cathode side of a molten carbonate fuel cell. With the STS310S,
corrosion proceeded via three steps; a formation step of unstable corrosion product, a protection step against corrosion until
breakaway, and an advance step of corrosion after breakaway. The final corrosion product was LiFeO2 and the loss of mass was 6.5 mg/cm2 after a corrosion test of 480 hr at 650°C. The SC-STS310S showed more effective corrosion resistance, however, than did common
STS310S. There was especially no corrosion loss on the SC-STS310S after the 480 hr corrosion test. It is anticipated that
it will be very useful as an alternative separator on the cathode side off the MCFC in the future. 相似文献
35.
36.
We study quantum teleportation between two different types of optical qubits using hybrid entanglement as a quantum channel under decoherence effects. One type of qubit employs the vacuum and single-photon states for the basis, called a single-rail single-photon qubit, and the other utilizes coherent states of opposite phases. We find that teleportation from a single-rail single-photon qubit to a coherent-state qubit is better than the opposite direction in terms of fidelity and success probability. We compare our results with those using a different type of hybrid entanglement between a polarized single-photon qubit and a coherent state. 相似文献
37.
Seung Jin Chang Jae Young Lee Jin Bae Park Yoon Ho Choi 《International Journal of Control, Automation and Systems》2015,13(2):311-318
In this paper, we propose an actor-critic neuro-control for a class of continuous-time nonlinear systems under nonlinear abrupt faults, which is combined with an adaptive fault diagnosis observer (AFDO). Together with its estimation laws, an AFDO scheme, which estimates the faults in real time, is designed based on Lyapunov analysis. Then, based on the designed AFDO, a fault tolerant actor- critic control scheme is proposed where the critic neural network (NN) is used to approximate the value function and the actor NN updates the fault tolerant policy based on the approximated value function in the critic NN. The weight update laws for critic NN and actor NN are designed using the gradient descent method. By Lyapunov analysis, we prove the uniform ultimately boundedness (UUB) of all the states, their estimation errors, and NN weights of the fault tolerant system under the unpredictable faults. Finally, we verify the effectiveness of the proposed method through numerical simulations. 相似文献
38.
Geun Bum Koo Jin Bae Park Young Hoon Joo 《International Journal of Control, Automation and Systems》2013,11(6):1075-1083
In this paper, a novel intelligent digital redesign (IDR) technique using the guaranteed cost control method is proposed for nonlinear systems which can be represented by a Takagi-Sugeno (T-S) fuzzy model. The IDR technique, which is one of the sampled-data fuzzy controller design methods, guarantees not only the stability condition of the sampled-data closed-loop system with the sampleddata fuzzy controller and the state-matching error is presented. By using the concept of the guaranteed cost control method, sufficient conditions are obtained for both minimization of the state-matching error and stabilization of the sampled-data closed-loop system and derived in terms of linear matrix inequalities (LMIs). Finally, a numerical example is provided to verify the effectiveness of the proposed technique. 相似文献
39.
Young-Hun Lim Myung-Eui Song Won-Hee Lee Hui-Je Cho Dae-Sung Bae 《Multibody System Dynamics》2009,22(2):145-162
The paper proposes a multibody dynamic simulation to numerically evaluate the generated axial force (GAF) and plunging resistant
force (PRF) practically related to the shudder and idling vibration of an automobile. A numerical analysis of the drive shaft
coupling of a ball joint (BJ) and two plunging type joints, a tripod joint (TJ), and a very low axial force tripod joint (VTJ),
are conducted using the commercial program DAFUL. User-defined subroutines of a friction model illustrating the contacted
parts of the outboard and inboard joint are subsequently developed to overcome the numerical instability and improve the solution
performance. The Coulomb friction effect is applied to describe the contact models of the lubricated parts in the rolling
and sliding mechanisms. The numerical results, in accordance with the joint articulation angle variation, are validated with
experimentation. The offset between spider and housing is demonstrated to be the critical role in producing the third order
component of the axial force that potentially causes the noise and vibration in the vehicle. The VTJ shows an excellent behavior
for the shudder when compared with the TJ. In addition, a flexible nonlinear contact analysis coupled with multibody dynamics
is also performed to show the dynamic strength characteristics of the rollers, housing, and spider. 相似文献
40.
Feng Feng Young Bae Jun 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2009,13(11):1113-1121
The notion of an inductive semimodule over an ordered *-semiring is introduced and some related properties are investigated.
Inductive semimodules are extensions of several important algebraic structures such as Kleene modules, Kleene algebras and
inductive *-semirings. We prove that an inductive semimodule over an ordered *-semiring K is a Kleene module if and only if K is a Kleene algebra. Moreover, we establish that the vector module of an inductive semimodule over an ordered Conway semiring
is again an inductive semimodule over the matrix semiring. Consequently, in an inductive semimodule over an ordered Conway
semiring, least solutions to linear inequation systems can be denoted by linear expressions, avoiding the least fixed point
operator. In addition, we also introduce a related notion called weak inductive semimodules, and propose several open problems
on them.
相似文献
Young Bae JunEmail: |