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Gang Chen,Yu Jin,Jing Wang,Cheng Zhang,Qiang Chen,Hongming Zhang,Xingjian Zhao,Zhiyong Li,Changhai Xie,Zhiming Du 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
Isothermal compression tests were carried out to study the hot deformation behavior of T2 copper under various conditions. The deformation parameters, such as temperature and strain rate, have strong influence on flow stress and microstructureevolution of the alloy. A unified dislocation density-based model considering dynamic recovery and recrystallization wasestablished. And material parameters of the developed model were optimized by genetic algorithm. Comparisons betweenthe experimental and model data demonstrates that the developed model can precisely describe the flow behavior at quitewide range of deformation conditions. Meanwhile, the designed iterative procedure allows the model to be applied in timevariantdeformation conditions. Processing map and microstructure examination were constructed to optimize the processingwindow of the studied alloy. According to the processing maps, flow instability mainly appeared at low temperatures of500–650 °C and strain rates higher than 0.1 s−1. The optimum deformation parameters of T2 copper was concluded as thetemperature range of 700–800 °C and the strain rate of 0.1–1 s−1.
Zhang, Gang,Xia, Tian,Zhao, Jinbiao,Liu, Ling,He, Pingli,Zhang, Shuai,Zhang, Liying Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.2
Objective: Two experiments were conducted to evaluate tetrabasic zinc chloride (TBZC) on the health of weaned pigs, and to determine the optimal supplemental concentrations and whether dietary TBZC could replace the pharmacological concentrations of dietary zinc oxide (ZnO) to improve growth performance and decrease Zn excretion in weaned pigs. Methods: In Exp. 1, 180 weaned pigs (8.92±1.05 kg body weight [BW]) were randomly assigned to 1 of 5 treatments, including the basal diet containing 125 mg/kg zinc sulfate (ZnSO<sub>4</sub>), and the basal diet with 1,200, 1,800, 2,400, or 3,000 mg/kg TBZC supplementation. In Exp. 2, 240 weaned pigs (7.66±1.09 kg BW) were randomly assigned to 1 of 5 treatments, including a negative control diet without Zn supplementation, a positive control diet (2,250 mg/kg ZnO), and 3 experimental diets with different concentrations of TBZC supplementation (1,000, 1,250, and 1,500 mg/kg). Results: In Exp. 1, the average daily gain (ADG), feed efficiency (G:F) and diarrhea incidence responded quadratically (p<0.01) as the TBZC supplemental concentrations increased, and pigs fed 1,200 and 1,800 mg/kg TBZC showed the best growth performance. Moreover, 1,800 mg/kg TBZC supplementation showed the greatest (p<0.01) total antioxidant capacity and glutathione peroxidase activities in liver of pigs. Histopathological examination revealed lesions in heart, liver, lung and kidney, and mild or severe histological lesions mainly occurred with the supplementation of 2,400 and 3,000 mg/kg TBZC. In Exp. 2, 1,000 and 1,250 mg/kg TBZC supplementation in diets significantly (p<0.01) increased ADG and G:F of weaned pigs, reduced Zn excretion in feces, and had no effect on diarrhea-reducing compared to 2,250 mg/kg ZnO supplementation. Conclusion: The TBZC is a potential alternative to ZnO. The recommended concentration of TBZC in weaned pig diets is 1,000 to 1,250 mg/kg.
Gang Zhang,Jianglin Qian,Zhigang Liu,Zhongbei Tian 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
Four-quadrant converters (4QCs) are widely used as AC-DC power conversion interfaces in many areas. A control delaycommonly exists in the digital implementation process of 4QCs, especially for high power 4QCs with a low switching frequency. This usually results in alternating current distortion, increased current harmonic content and system instability. In this paper, thecontrol delay is divided into a computation delay and a PWM delay. The impact of the control delay on the performance of a4QC is briefly analyzed. To obtain a fundamental value of AC current that is as accurately as possible, a specific samplingmethod considering the PWM pattern is introduced. Then a current predictive control based on a modified z-transform isproposed, which is effective in reducing the control delay and easy in terms of digital implementation. In addition, it does notdepend on object models and parameters. The feasibility and effectiveness of the proposed predictive current control method isverified by simulation and experimental results.
Gang Zhang,Chang Ho Ra,Hua-Min Li,Tian-zi Shen,Byung-ki Cheong,Won Jong Yoo IEEE 2010 IEEE transactions on electron devices Vol.57 No.11
<P>This paper proposes a modified engineered-potentialwell (MW) for NAND flash memory application. The MW was formed by using a transitional SiO<SUB>2</SUB>/SiO<SUB>x</SUB>,Na-TiO<SUB>x</SUB>,N<SUB>y</SUB> tunnel barrier, a trap-rich TiO<SUB>2</SUB> trapping layer, and an abrupt SiO<SUB>2</SUB> block barrier. The transitional tunnel barrier shrinks to enhance the tunneling of carriers during programming/erasing (P/E) and extends to suppress charge loss during data retention. Deep-level transient spectroscopy suggests that this tunnel barrier has few shallow traps after a N<SUB>2</SUB> + O<SUB>2</SUB> thermal treatment, and the TiO<SUB>2</SUB> trapping layer has deep electron traps. With the variable tunnel barrier and deep electron traps, the MW device showed promising performance in fast programming (<; μs) at low-voltage operation (7-10 MV/cm), good P/E endurance (> 10<SUP>6</SUP> P/E cycles), large threshold voltage window (ΔV<SUB>th</SUB> =M> V), as well as improved data retention at 125 °C.</P>
Gang Zhang,Seung-Hwan Lee,Chang Ho Ra,Hua-Min Li,Won Jong Yoo IEEE 2009 IEEE transactions on electron devices Vol.56 No.9
<P>In this paper, a Si<SUB>3</SUB>N<SUB>4</SUB>/ZrO<SUB>2</SUB> split charge trapping layer (SCTL) is proposed for multibit-cell Flash memory. The complementary potential wells of Si<SUB>3</SUB>N<SUB>4</SUB>/ZrO<SUB>2</SUB> storage nodes enable independent node control when the Fowler-Nordheim (F-N) method is applied for programming/erasing (P/E). Experiment and simulation results suggest that the 2-bit (2-b) charge storage is accomplished by physical data node separation for the SCTL rather than charge injection control. The well-confined charge storages suppress the second-bit effect, enabling excellent 2-b data clearance for short-channel SCTL devices. It was found that the remaining memory windows after 10<SUP>5</SUP> s decrease, dependent on the difference of the trap properties between Si<SUB>3</SUB>N<SUB>4</SUB> and ZrO<SUB>2</SUB>.</P>
Study on economic performances of multi-span suspension bridges part 2: parametric study
Zhang, Li-Wen,Xiao, Ru-Cheng,Sun, Bin,Jiang, Yang,Zhang, Xue-Yi,Zhuang, Dong-Li,Zhou, Yun-Gang,Tu, Xue Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.47 No.2
Economic performances of consecutive multi-span suspension bridges are studied. The material amount and cost estimation formulas of the bridges have been derived in the part 1 of the study. A parametric study is carried out based on the formulas for investigating the different factors' effect on the bridge cost. The factors include the bridge sag, the bridge span, the bridge foundation and the environment condition, etc. Then, an economical layout of the bridges is proposed for different conditions. Lastly, a selection of suspension bridge types is discussed based on the economy of bridges.
Laboratory Confirmation of A Suspicious Meningococcal Meningitis Death Case
Zhang Tie-Gang,He Xiong,Chen Li-Juan,He Jing-Guo,Luo Ming,Yang Jie,Shao Zhu-Jun,Sun Mei-Ping The Microbiological Society of Korea 2006 The journal of microbiology Vol.44 No.4
A suspicious meningococcal meningitis death case was reported to the Beijing CDC. The blood specimen was analyzed via multi-PCR and MLST. 6 isolates from close contacts were analyzed via PFGE and MLST. According to the results of the above analyses, the cause of this case was identified as a serogroup A Neisseria meningitidis, which, in terms of sequence typing, belonged the ST7 group.
Zhang, Gang,Qian, Jianglin,Liu, Zhigang,Tian, Zhongbei The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
Four-quadrant converters (4QCs) are widely used as AC-DC power conversion interfaces in many areas. A control delay commonly exists in the digital implementation process of 4QCs, especially for high power 4QCs with a low switching frequency. This usually results in alternating current distortion, increased current harmonic content and system instability. In this paper, the control delay is divided into a computation delay and a PWM delay. The impact of the control delay on the performance of a 4QC is briefly analyzed. To obtain a fundamental value of AC current that is as accurately as possible, a specific sampling method considering the PWM pattern is introduced. Then a current predictive control based on a modified z-transform is proposed, which is effective in reducing the control delay and easy in terms of digital implementation. In addition, it does not depend on object models and parameters. The feasibility and effectiveness of the proposed predictive current control method is verified by simulation and experimental results.
Online Monitoring System of Fish Behavior
Gang Xiao,Wen Zhang,Yong-Liang Zhang,Jiu-Jun Chen,Shan-Shan Huang,Lu-Ming Zhu 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
In order to overcome the defect of physic-chemical monitoring system and enhance the intelligence of biological monitoring technology, an online monitoring system of fish behavior is proposed in this paper. The main contributions of this system are as follows: 1) adaptive background updating algorithm (ABU); 2) automatic camshift tracking algorithm (ACT) with twice searching; 3) particle filter tracking (PFT) algorithm; 4) persistent turning walker (PTW) model; 5) artificial immune algorithm (AIA). This online system is used to monitor and analyse the fish behavior continuously, establish a normal behavior model and detect the anormal behavior. Experimental results show that the system is running stably and has achieved well effect in the simulation environment.