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Jian‑bo Xie,Bei‑bei Liu,Xiang‑yu Wu,Jian‑xun Fu 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.5
This work aims to comprehensively summarize the types and distribution of the isolated Bi particles and MnS inclusions inthe Bi-bearing steels, to study the precipitated behavior of sulfide, and to study the effect of Bi particles on grain sizes andthe volume thermal expansion coefficients of the steels. Results show that the average percentage of the isolated Bi particles,semi-encapsulation, complete encapsulation, back-bridge, tiny encapsulation, cavity bridge Bi–MnS inclusions in the Bibearingsteels was 16.89%, 20.49%, 3.44%, 16.89%, 31.63%, 10.66%, respectively. The average equivalent diameters of thegrains in the 0 ppm, 130 ppm, 240 ppm, 760 ppm, 1200 ppm and 2300 ppm Bi content steels were 20.88, 20.17, 19.54, 18.13,13.98 and 13.25 μm, respectively. The precipitated equilibrium mass concentration product of the MnS (w[Mn]·w[S]) wascalculated to be 1.07, and the solid fraction fS value was 0.61. At 950 °C, the volume thermal expansion coefficient change(ΔVE) in 760 ppm Bi content steel was minimum 4 × 10–10%, while at 461.6 °C the ΔVE was maximum, 0.09%, which meansthat Bi affected the volume thermal expansion of the steel strongest in this temperature range.
Enhancement of Impurity, Machinability and Mechanical Properties in Te-Treated 0Cr18Ni9 Steel
Jian‑bo Xie,Tian Fan,Han Sun,Zhi‑qi Zeng,Jian‑xun Fu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
To enhance the machinability and mechanical properties of 0Cr18Ni9 steel, free-machining element Te was introduced inthis work. By adding various quantities of Te to steel, several machining and tensile tests were carried out. Results show thatwith Te addition of 530 ppm, the number of inclusion sizes below 1 μm disappeared. With raising Te from 360 to 530 ppm,more MnTe–MnS inclusions of 10–40 μm were in spherical shape; above 50 μm2, the ratio of inclusion area at 530 ppmwas greatest among all, and the large-sized inclusions occupied a larger share. Te addition contributed to the surfaces ofmachining steels more smooth. The ultimate tensile strength of steel increased from 399 to 435 MPa. Te resulted in growthof sulfides and improved the machinability of steel.
The Scheme of Power Allocation for Decode-and-Forward Relay Channel in Energy Harvesting WSNs
Jianli Xie,Cuiran Li 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.12
Recently, the issue of excessive energy consumption in wireless communications has become increasing critical, and the energy harvesting as a renewable energy resource, has received extensive attractions. In this paper, a wireless sensor network (WSN) is considered, where the source-destination pair communicates via an energy harvesting relay links. We study the problem of the harvested energy distribution among the source, relay and destination nodes. An effective power allocation scheme is developed which exploits the decode-and-forward (DF) relaying strategy and channel state information. The outage probability is analyzed and simulation results show that the outage performance for two sub-channels is always performs well in the cases of different threshold target data rate. Moreover, the effect of the different radio of the optimal sub-channel gain and Rayleigh channel gain on the outage performance is evaluated.
Dynamic Entropy Based Combination Weighted Clustering Approach for High-Speed Ad hoc Network
Jianli Xie,Cuiran Li,Hui Zhou 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.3
Weight based clustering has become the mainstream clustering algorithm in low-speed Ad hoc networks because of its excellent cluster stability. However, due to the dynamic topology changing in high-speed Ad hoc network, the cluster stability (network stability) decreased and the cluster maintenance costs increased sharply. To solve the problem, we propose a dynamic entropy based combination weighted clustering approach (DECW). First, according to the history messages of an evaluation node in the network, the upper bound and the lower bound value of each clustering index will be recorded, so the information entropy deviation of the indexes and dynamic entropy weight of each node can be obtained. After, the linear combination weights set of evaluation nodes is modeled as the second-order norm game , and the weight vector deviation is minimized as the optimization goal to get the multi-node dynamic entropy weights. In the cluster maintenance, a new Monte Carlo optimization is proposed to avoid the frequent cluster-heads (CHs) replacement induced of high node mobility of. Simulation results reveal that the proposed approach has the better adaptability in high-speed mobile environment.
Jian Zhang,Wen-Bo Xie,Mou-Quan Shen,Ling Huang 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.5
The control problem of T-S fuzzy system with actuator amplitude, rate and acceleration saturations isaddressed in this paper, where state augmented feedback controller with LMIs (Liner Matrix Inequalities) constraintconditions are proposed. Dynamic decoupling method is applied to fuzzify the input magnitude saturation nonlinearityinto several sub-linear systems with fuzzy rules, thus a new T-S fuzzy system with input rate and accelerationsaturations can be obtained. Then PDC (parallel distributed compensation) and NPDC (non-PDC) controller areboth designed for the new T-S fuzzy system. The first and second order derivatives of input variable are given toobtain an augmented fuzzy system. As the augmented system output variable, the input rate is represented by firstorder derivative of the input term, the rate saturation constraint is described through norm bounded method. Moreover,the polytopic approach is used to replace the second order derivative of the input term, and a state augmentedfeedback NPDC controller is designed, the domain of attraction optimization process is also given. Finally, twopractical examples are presented to show the effectiveness of proposed method.
Jian Sun,Dong-Wei Xie,Hong-Wei Zhao,De-Tang Zou 한국유전학회 2013 Genes & Genomics Vol.35 No.5
Aminotransferases are pyridoxal 50-phosphatedependent enzymes that play crucial roles in plant growth, development, and responses to abiotic stress. The class III aminotransferase family (ATIII family) is an important subfamily. However, no characterization of rice ATIII genes has been previously reported. Using available rice genome sequence information, we identified 12 japonica and 13 indica ATIII genes that were randomly localized on chromosomes 2, 3, 4, 5, 7, 8, and 11. Information provided by the Plant Genome Duplication Database revealed that four japonica and four indica ATIII genes are the results of segmental duplications, and two japonica and six indica genes resulted from tandem duplications. A phylogenetic analysis of the ATIII genes in japonica, indica and Arabidopsis enabled the classification of the genes into six different groups, and the characteristics were established before the monocot-dicot and japonica–indica split. An analysis of the Ka/Ks, divergence time and average indel length suggested the diverse selection styles of the duplicated gene pairs. Gene structure and motif analyses revealed that the ATIII gene family has experienced extensive divergence. Real-time PCR was performed to examine the expression pattern of the japonica ATIII genes in response to various abiotic stresses including drought, salt, and cold. The results suggested that most of the genes were differentially up- or down-regulated in rice seedlings in response to at least one stress factor, which indicates the key role of the rice ATIII gene family in responding to abiotic stresses. These results provide a basis for elucidating the roles of the ATIII genes and their further functional analysis under abiotic stresses.
ROOM-TEMPERATURE FERROMAGNETISM IN SnO 2 NANOFIBERS AND NANOTUBES PREPARED BY ELECTROSPINNING
JIAN-GUO ZHAO,WEI-YING ZHANG,ZHAO-JUN LIU,ZHONG-LI LIU,YA-JUAN ZHANG,ER-QING XIE,XIU-YUN AN,YONG-FENG CHEN,CHANG-YOU ZHANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.2
SnO 2 nano¯bers and nanotubes were synthesized by electrospinning method. Magnetizationmeasurement indicates that the SnO 2 nano¯bers and nanotubes annealed in air at 500?C exhibitthe room-temperature ferromagnetism and the ferromagnetism of nanotubes is stronger than thenano¯bers. Selected area electron di®raction, X-ray di®raction and Raman measurements showthat all the samples possess a typical rutile structure and no other impurity phases are observed. The results of the Raman spectra also indicate that there are lots of defects existing in thefabricated samples. The observed room-temperature ferromagnetism in SnO 2 nano¯bers andnanotubes possibly originates from oxygen vacancies. The ¯eld cooled (FC) and zero-¯eld-cooled(ZFC) magnetization curves indicate that the Curie temperature T C is above 300 K.