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Wei Gao,Hongli Guo,Juhyun Yoo 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
Ba0:7Sr0:3TiO3 films with controlled thickness of above 20l m were produced on metal substrates by an electrophoretic depositionmethod (EPD). The composition, crystal structure and microstructure of the deposited lms were characterised using scanningelectron microscopy and X-ray diractometry. The dielectric properties were measured with a Hewlett-Packard 4294A precision impedance analyser. The sintered BST lms showed a sharp perovskite structure with uniform microstructure. The results indicatedthat a typical BST lm of 20l m thick produced by EPD after sintering for dierent times exhibited a relative dielectric constant ranging from 2300 to 5200 at room temperature and a dissipation factor ranging from 0.062 to 0.118 at 1 kHz. These lms alsopossess excellent adhesion to the substrate after the sintering treatment.
Precision Nanometrology and its Applications to Precision Nanosystems
Wei Gao 한국정밀공학회 2005 International Journal of Precision Engineering and Vol.6 No.4
In this paper, a new field of metrology called "precision nanometrology" is presented. The "precision nanometrology" is the result of evolutions of the traditional "precision metrology" and the new "nanometrology". "Precision nanometrology" is defined here as the science of dimensional measurement and motion measurement with 100 ㎚ to 0.1 ㎚ resolution/uncertainty within a range of micrometer to meter. The definition is based on the fact that nanometrology in nanoengineering and the precision industries, such as semiconductor industry, precision machine tool industry, precision instrument industry, is not only concerned with the measurement resolution and/or uncertainty but also the range of measurement. It should also be pointed out that most of the measurement objects in nanoengineering have dimensions larger than I micrometer. After explaining the definition of precision nanometrology, the paper provides several examples showing the critical roles of precision nanometrologv in precision nanosystems, including nanometrology system, nanofabrication system, and nanomechatronics system.
TIGHT TOUGHNESS CONDITION FOR FRACTIONAL (g,f,n)-CRITICAL GRAPHS
Wei Gao,Li Liang,Tianwei Xu,Juxiang Zhou 대한수학회 2014 대한수학회지 Vol.51 No.1
A graph G is called a fractional (g,f,n)-critical graph if any n vertices are removed from G, then the resulting graph admits a fractional (g,f)-factor. In this paper, we determine the new toughness condition for fractional (g,f,n)-critical graphs. It is proved that G is fractional (g,f,n)-critical if t(G) ≥ b3-1+bn/a. This bound is sharp in some sense. Furthermore, the best toughness condition for fractional (a, b,n)-critical graphs is given.
Wei Gao,Aodong Chen,Bowen Zhang,Ping Kong,Chenli Liu,Jie Zhao 아세아·태평양축산학회 2015 Animal Bioscience Vol.28 No.4
This study evaluated the in situ ruminal degradability, and subsequent small intestinal digestibility (SID) of dry matter, crude protein (CP), and amino acids (AA) of cottonseed meal (CSM), sunflower seed meal (SFSM) and distillers dried grains with solubles (DDGS) by using the modified three-step in vitro procedure. The ruminal degradability and subsequent SID of AA in rumen-undegradable protein (RUP-AA) varied among three protein supplements. The result show that the effective degradability of DM for SFSM, CSM, and DDGS was 60.8%, 56.4%, and 41.0% and their ruminal fermentable organic matter was 60.0%, 55.9%, and 39.9%, respectively. The ruminal degradable protein (RDP) content in CP for SFSM, CSM, and DDGS was 68.3%, 39.0%, and 32.9%, respectively, at the ruminal solid passage rate of 1.84%/h. The SFSM is a good source of RDP for rumen micro-organisms; however, the SID of RUP of SFSM was lower. The DDGS and CSM are good sources of RUP for lambs to digest in the small intestine to complement ruminal microbial AA of growing lambs. Individual RUP-AA from each protein source was selectively removed by the rumen micro-organisms, especially for Trp, Arg, His, and Lys (p<0.01). The SID of individual RUP-AA was different within specific RUP origin (p<0.01). Limiting amino acid was Leu for RUP of CSM and Lys for both RUP of SFSM and DDGS, respectively. Therefore, different protein supplements with specific limitations should be selected and combined carefully in growing lambs ration to optimize AA balance.
Leader-following Consensus of Second-order Multi-agent Systems With Input Delays
Wei Gao,Yan Ren,LiYun Zhao,Kai Weng,HuiMin Wang 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.9
This paper studies the leader-following consensus of second-order multi-agent systems with input delays. Firstly, a feedback-tracking control protocol with the leader’s delayed state derivative is proposed to guarantee the leader-following consensus. Secondly, considering the same input delay of the second-order multi-agent system, the explicit formula of the upper bound of delay for the asymptotic stability of the second-order multi-agent system is obtained by using the frequency domain analysis method. Compared with the latest existing controllers, the controller designed in this paper improves the convergence speed and tracking accuracy. Thirdly, a variety of diverse input delays are further considered, the feedback tracking controller is designed to improve the convergence speed and tracking accuracy, and sufficient conditions of leader-following consensus are given by using the generalized Nyquist stability criterion. Finally, simulation examples are given to show the effectiveness of our control protocol.
Wei Gao,Jintang Guo,Yakai Feng,Jian Lu,Musammir Khan 한국고분자학회 2012 Macromolecular Research Vol.20 No.10
Phosphorylcholine groups were covalently introduced onto a polycarbonateurethane (PCU) surface in order to create a biomimetic structure on the polymer surfaces. After introducing primary amine groups onto the polymer surface by 1,6-hexanediamine, phosphorylcholine groups were covalently linked onto the surface by the reductive amination between the amino group and the aldehyde group of phosphorylcholine glyceraldehyde (PCGA). The results of water contact angle test, X-ray photoelectron spectroscopy (XPS), and X-ray fluorescence spectrometer (XRF) analysis of the modified films indicated that PCGA had already been covalently linked to the PCU surface. The topographies and surface roughnesses were both imaged and measured by atomic force microscopy (AFM). Scanning electron microscopy (SEM)observation of the PCU films after treatment with platelet-rich plasma demonstrated that platelets had rarely adhered to the surface of the PCGA-grafted PCU films but had mainly adhered to the surface of the blank PCU films. The platelet adhesion result indicated that the PC modified PCU films could resist platelet adhesion after grafting with PCGA, and that these PCGA-grafted PCU materials, potentially, might be applied as blood-contacting materials.
Junfang Zhao,Weigao Ge 한국전산응용수학회 2009 Journal of applied mathematics & informatics Vol.27 No.5
In this paper, we are concerned with the following four point boundary value problem with one-dimensional p-Laplacian, (∅p(x'(t)))' + h(t)f(t, x(t), |x'(t)|) = 0, 0 < t < 1, x'(0) −δx(η) = 0, x'(1) + δx(η) = 0, where ∅p(s) = |s|p−2s, p > 1, δ > 0, 1 > η > ξ > 0, ξ +η= 1. By using a fixed point theorem in a cone, we obtain the existence of at least three symmetric positive solutions. The interestingpoint is that the boundary condition is a new Sturm-Liouville-like boundary condition, which has rarely been treated up to now. In this paper, we are concerned with the following four point boundary value problem with one-dimensional p-Laplacian, (∅p(x'(t)))' + h(t)f(t, x(t), |x'(t)|) = 0, 0 < t < 1, x'(0) −δx(η) = 0, x'(1) + δx(η) = 0, where ∅p(s) = |s|p−2s, p > 1, δ > 0, 1 > η > ξ > 0, ξ +η= 1. By using a fixed point theorem in a cone, we obtain the existence of at least three symmetric positive solutions. The interestingpoint is that the boundary condition is a new Sturm-Liouville-like boundary condition, which has rarely been treated up to now.