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Chuan Liu,Jia-bin Shen,Chang-hua Lin,Jian-fei Wang,Jian-xin Wang 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.5
Ultrasonic impact treatment (UIT) was carried out on three specimens with different strengths and, to measure the subsurface stress distribution of the specimens, the layer-by-layer removal x-ray diffraction method was applied. The stress redistribution due to material removal was corrected by finite element analysis. The effect of material strength on the after-UIT subsurface stress was investigated. The results show that the UIT can cause a compressive stress layer with a depth of over 2.5 mm for specimens with different strengths, while the material strength has no significant effect on the depth of UIT-induced stress. The UIT-induced peak compressive stresses in the three specimens exceed the material yield strength, appearing at the depth of 0.2 mm beneath the surface and increasing with the increase of material yield strength. The ratio of UIT-induced peak compressive stress magnitude to material yield strength decreases with the increase of material yield strength.
Transcriptional analysis of Pieris rapae in response to P. rapae granulovirus
Hai-Jian Huang,Tong-Qiang Zhang,Qiao Lin, Jian-Hui Ye,Chuan-Xi ZHANG,Bao-Qin Zhang 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.2
Pieris rapae granulovirus (PrGV) is an important pathogen that has been exploited as a microbial insecticide to control agriculture pests. They can specifically infect cabbage butterfly (Pieris rapae), causing a series of pathological symptoms. In this infected P. rapae at 6 h and 72 h. As a result, a series of host genes were significantly modulated following PrGV infection, including those correlated with exoskeleton, ribosome, heat shock protein (HSP), proteasome, oxidation-reduction and apoptosis. Taken together, our study unveiled the P. rapae response to PrGV at different time point and provided a potential strategy for pest management.
Refinement of the Primary Si Particles in Hypereutectic Aluminum Alloy
Chang-Chuan Hsu,Jian-Yih Wang,Jian-Jia Huang,Shyong Lee 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.4
Al-Si alloys, with such excellent properties as low weight, low thermal expansion coefficient, and high wear-resistance, are ideal materials for the automobile and aerospace industries. However, their applications have been hampered by the coarsening of the primary-Si particles in Al-Si alloys. In this study, simple plastic deformation was used to reduce primary-Si particles and to improve the wear-resistance and mechanical strength of Al-Si alloys. Experimental results showed that mechanical rolling decreased the grain size of primary-Si particles in Al-Si alloys and reduced the variation in silicon particle size. After 60%-roll-reduction, the alloy showed an improved tensile strength of 340 MPa, which is attributed to the work hardening of the aluminum matrix and the dispersion strengthening of the primary-Si particles. Data from wear-resistance testing showed that rolling led to a reduction in wear loss. This improvement in wear resistance is due to the particle size refinement of silicon at a high percentage-roll-reduction.
Chuan-Xi Zhang,Hai-Jun Xu,Mei-Jun Tang,Qiang Xiao,Jian Hong,Xiu-cui Ma 한국미생물학회 2006 The journal of microbiology Vol.44 No.1
The tea looper caterpillar, Ectropis obliqua, is one of the major pests of tea bushes. E. obliqua single-nucleocapsid nucleopolyhedrovirus (EcobSNPV) has been used as a commercial pesticide for biocontrol of this insect. However only limited genetic analysis for this important virus has been done up to now. EcobSNPV was characterized in this study. Electron microscopy analysis of the occlusion body showed polyhedra of 0.7 to 1.7 μm in diameter containing a single nucleocapsid per envelope of the virion. A 15.5 kb genomic fragment containing EcoRI-L, EcoRI-N and HindIII-F fragments, was sequenced. Analysis of the sequence revealed that the fragment contained eleven potential open reading frames (ORFs): lef-1, egt, 38.7k, rr1, polyhedrin, orf1629, pk-1, hoar and homologues to Spodoptera exigua multicapsid NPV (SeMNPV) ORFs 15, 28, and 29. Gene arrangement and phylogeny analysis suggest that EcobSNPV is closely related to the previously described Group II NPV. Bioassays on lethal concentration (LC50 and LC90) and lethal time (LT50 and LT90) were conducted to test the susceptibility of E. obliqua larvae to the virus.
Chuan-Xi Zhang,Zhong-Jian Guo,Shi-Heng An,Dun Wang,Yan-He Liu,V. Shyam Kumar 한국생화학분자생물학회 2005 BMB Reports Vol.38 No.3
Open reading frame 29 (ha29) is a gene specific for Helicoverpa armigera single-nucleocapsid nucleopolyhedrovirus (HearSNPV). Sequence analyses showed that the transcription factor Tfb2 motif, bromodomain and Half-A-TPR (HAT) repeat were present at aa 66-82, 4-76, 55-90 of the Ha29 protein respectively. The product of Ha29 was detected in HearSNPV-infected HzAM1 cells at 3 h post-infection. Western blot analysis using a polyclonal antibody produced by immunizing a rabbit with purified GST-Ha29 fusion protein indicates that Ha29 is an early gene. The size of Ha29 product in infected HzAM1 cells was about 25 kDa, which was larger than the presumed size of 20.4 kDa. Tunicamycin treatment of HearSNPV-infected HzAM1 cells suggested that the Ha29 protein is N-glycosylated. Fluorescent confocal laser scanning microscope examination, and Western blot analysis of purified budded virus (BVs), occlusion-derived virus (O DVs), cell nuclear and cytoplasmic fraction, showed that the Ha29 protein was localized in the nucleus. Our results suggested that ha29 of HearSNPV encodes a non-structurally functional protein that may be associated with virus gene transcription in Helicoverpa hosts.
OPE molecular junction as a hydrogen gas sensor
Jian-Guo Xin,Chuan-Lu Yang,Mei-Shan Wang,Xiao-Guang Ma 한국물리학회 2018 Current Applied Physics Vol.18 No.3
Oligo(phenylene ethynylene) (OPE) molecular junction has been suggested as a H2 molecule sensor based on calculations using the first principles of density–functional theory and non-equilibrium Green's function. The electronic transport properties of the OPE molecule between two Au electrodes with or without adsorbed H2 molecules are investigated. Results show that the adsorbed H2 molecule significantly changes the characteristics of the current–voltage curve of the OPE molecular junction. The pure OPE molecular junction exhibits a significant negative differential resistance, but this kind of phenomenon will disappear or weaken after hydrogen molecules are adsorbed. The conductance of the junction also obviously decreases in the bias range of [−0.4, 0.4] V after adsorbing H2 molecules. These effects can be used to design a H2 molecule sensor.
Chuan-Dong Bai,Tong Mu,Zhong-Hua Pang,Jian Sun,Guo-Ping Liu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2
In this paper, the output tracking control problem is investigated for a networked control system with twochannel random network delays and packet dropouts as well as stochastic noise. To actively compensate for these random communication constraints in the feedback and forward channels, a novel networked predictive control (NPC) method is proposed based on the input-output difference equation model, where the two-channel communication constraints are handled separately according to their different features. Furthermore, different from the existing NPC methods based on round-trip time delays, actual control inputs rather than the predicted ones are employed to generate future control commands. Then a delay-independent closed-loop stability condition is obtained, and a condition to guarantee a zero steady-state output tracking error is derived. Also, theoretical analysis shows that the proposed NPC method can achieve the same output tracking performance as the corresponding local control system. Finally, the effectiveness of the proposed method is evaluated by simulation and experimental results.
Block-Level Resource Allocation with Limited Feedback in Multicell Cellular Networks
Jian Yu,Chang-chuan Yin 한국통신학회 2016 Journal of communications and networks Vol.18 No.3
In this paper, we investigate the scheduling and powerallocation for coordinated multi-point transmission in downlinklong term evolution advanced (LTE-A) systems, where orthogonalfrequency division multiple-access is used. The proposed schemejointly optimizes user selection, power allocation, and modulationand coding scheme (MCS) selection to maximize the weighted sumthroughput with fairness consideration. Considering practical constraintsin LTE-A systems, the MCSs for the resource blocks assignedto the same user need to be the same. Since the optimizationproblemis a combinatorial and non-convex one with high complexity,a low-complexity algorithm is proposed by separating the userselection and power allocation into two subproblems. To furthersimplify the optimization problem for power allocation, the instantaneoussignal-to-interference-plus-noise ratio (SINR) and the averageSINR are adopted to allocate power in a single cell and multiplecoordinated cells, respectively. Simulation results show thatthe proposed scheme can improve the average system throughputand the cell-edge user throughput significantly compared with theexisting schemes with limited feedback.