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| 1 | Hall-Petch relationship in Mg alloys: A review显示文摘Grain refinement could effectively enhance yield strength of Mg alloys according to the well-known Hall-Petch theory. For decades, many studies have been devoted to the factors influencing the HallPetch slope(k) in Mg alloys. Understanding the factors influencing k and their mechanisms could offer guidance to design and produce high-strength Mg alloys through effective grain refinement hardening. A review and comments of the past work on the factors influencing k in Mg alloys are presented. Results of these previous investigations demonstrate that the value of k in Mg alloys varies with texture, grain size,temperature and stain. The influence of texture and grain size on k is found to be an essential result of the variation of deformation mode on k value. Without the variation of deformation modes, it is revealed that texture could also impose a significant effect on k and this is also summarized and discussed in this paper. The reason for texture effect on k is analyzed based on the mechanism of Hall-Petch relationship.In addition, it is found in face-centered cubic(fcc) or body-centered cubic(bcc) metals that boundary parameters(boundary coherence, boundary energy and boundary diffusivity) could strengthen twinning or slips to a different extent. Therefore, the role of boundary parameters is also extended into the k values in Mg alloys and discussed in this paper. In the end, we discuss the future research perspective of Hall-Petch relationship in Mg alloys. | Huihui Yu Yunchang Xin Maoyin Wang Qing Liu | 2018 | Journal of Materials Science & Technology2018，34，2： | 35 |
| 2 | THF_1 mutations lead to increased basal and wound-induced levels of oxylipins that stimulate anthocyanin biosynthesis via COI_1 signaling in Arabidopsis显示文摘Mutants defective in chloroplast development or photosynthesis are liable to accumulate higher levels of anthocyanin in photo-oxidative stress.However,regulatory mechanisms of anthocyanin biosynthesis in the mutants remain unclear.Here,we investigated the mechanism by which the deletion of thylakoid formation1(THF1) leads to an increased level of anthocyanin in Arabidopsis thaliana L.Physiological and genetic evidence showed that the increased level of anthocyanin in thf1 is dependent on coronatine-insensitive1(COM)signaling.Our data showed that thf1 had higher levels of basalα-linolenic acid(α-LeA),and methyl jasmonate(JA)-induced α-LeA and 12-oxophytodienoic acid(OPDA) than the wild type(WT).Consistently,expression levels of phospholipase genes including pPLAIIα and PLA-Iγ1 were elevated in thf1.Furthermore,inhibition of lipase activity by bromoenol lactone,a specific inhibitor of plant pPLA,led to producing identical levels of anthocyanins in WT and thf1 plants.Interestingly,OPDA biosynthesis was triggered by light illumination in isolated chloroplasts,indicating that new protein import into chloroplasts is not required for OPDA biosynthesis.Thus,we conclude that the elevated anthocyanin accumulation in thf1 is attributed to an increase in JA levels.This JA-mediated signaling to coordinate plant metabolism and growth in stress may be conserved in other photosensitive mutants. | Yi Gan Hong Li Ye Xie Wenjuan Wu Maoyin Li Xuemin Wang Jirong Huang | 2014 | Journal of Integrative Plant Biology2014，56，9： | 8 |
| 3 | Remaining useful life prediction for a nonlinear multi-degradation system with public noise显示文摘To predict the remaining useful life(RUL) for a class of nonlinear multi-degradation systems, a method is presented. In the real industrial processes, systems are usually composed by several parts or components, and these parts or components are working in the same environment, thus the degradations of these parts or components will be influenced by common factors. To describe such a phenomenon in degradations, a multi-degradation model with public noise is proposed. To identify the degradation states and the unknown parameters, an iterative estimation method is proposed by using the Kalman filter and the expectation maximization(EM) algorithm. Next, with known thresholds,the RUL of each degradation can be predicted by using the first hitting time(FHT). In addition, the RUL of the whole system can be obtained by a Copula function. Finally, a practical case is used to demonstrate the method proposed. | ZHANG Hanwen CHEN Maoyin ZHOU Donghua | 2018 | Journal of Systems Engineering and Electronics2018，29，2： | 6 |
| 4 | Single image haze removal via depth-based contrast stretching transform显示文摘Under the weather of haze, fog, or smoke, outdoor images show poor visibility and low contrast.Low contrast results in the difficulty for carrying out basic local feature(e.g., interest points and edges) detection algorithms, which are necessary procedures in some computer vision applications. Hence, increasing contrast of degraded images is very important since it is helpful in finding more distinct features from haze images.However, few single image haze removal methods can simultaneously achieve clear visibility, sufficiently high contrast, and simplicity. In this paper, we propose an intuitive and effective method, called the depth-based contrast stretching transform(DCST), to simultaneously obtain clear visibility and enhance contrast of a single haze gray image. The DCST stretches the contrast of haze images based on the coarse depth layers of scenes.Our method is simple and almost real time and can be extended to color images. We analyze in detail that the image stretched by the DCST has a higher local contrast than the image recovered via the physical-based model.Experiments demonstrate that images stretched by the DCST have excellent visibility and contrast compared with a few existing algorithms. Compelling performance is also presented by comparing the proposed method with other representative methods in the application of local feature detection. | LIU Qian CHEN MaoYin ZHOU DongHua | 2015 | Science China(Information Sciences)2015，58，1： | 4 |
| 5 | Precise control of a magnetically suspended double-gimbal control moment gyroscope using differential geometry decoupling method显示文摘Precise control of a magnetically suspended double-gimbal control moment gyroscope (MSDGCMG) is of vital importance and challenge to the attitude positioning of spacecraft owing to its multivariable, nonlinear and strong coupled properties. This paper proposes a novel linearization and decoupling method based on differential geometry theory and combines it with the internal model controller (IMC) to guarantee the system robustness to the external disturbance and parameter uncertainty. Furthermore, by introducing the dynamic compensation for the inner-gimbal rate-servo system and the magnetically suspended rotor (MSR) system only, we can eliminate the influence of the unmodeled dynamics to the decoupling control accuracy as well as save costs and inhibit noises effectively. The simulation results verify the nice decoupling and robustness performance of the system using the proposed method. | Chen Xiaocen Chen Maoyin | 2013 | Chinese Journal of Aeronautics2013，26，4： | 3 |
| 6 | Patterns and Timing in Expression of Early Auxin-Induced Genes Imply Involvement of Phospholipases A (pPLAs) in the Regulation of Auxin Responses显示文摘当 patatin 相关的 phospholipase A (pPLA ) 活动被植物生长素很快在 3min 以内激活,这被知道时,任何东西几乎不这个信号怎么影响象早导致植物生长素的基因的抄写一样的下游的回答或另外的生理的回答被知道。我们为与植物生长素有关的分子、生理的显型在 pPLA 基因家庭的成员与 T-DNA 插入屏蔽了异种。仅仅在九 Arabidopsis thaliana ppla 的击倒的异种显示了明显的组成的植物生长素相关的显型。比作野类型, ppla-III 异种幼苗减少了主要的根长度和增加的侧面的根数字。我们在九 ppla 异种为主要分子的植物生长素回答作为分子的读出测试了导致植物生长素的基因表示并且他们在所有发现植物生长素应答的基因表示的起来规定推迟。在植物生长素处理以后的三十分钟,多达 40% 导致植物生长素的基因的起来规定在变异的幼苗被推迟。我们在 ppla 异种与过分敏感的导致植物生长素的基因表示观察了仅仅一些盒子。当时在三 ppla 异种,它详细被调查,快速的起来规定(象在植物生长素刺激以后的 10min 一样早) 调整植物生长素的基因,被损害的、迟了的 transcriptional 回答是 wild-type-like。这规章或动态的显型一致地与经常影响了一样的基因的推迟的起来规定在不同 ppla 异种被观察。这个缺点没被仍然保持不变的 pPLA 抄本层次影响。这作为到植物生长素发信号的 pPLAs 的一个功能的连接显示 posttranslational 机制。对没有采用抄写规定,触发植物生长素回答的受体的需要被讨论。 | Corinna Labusch Maria Shishova Yunus Effendi Maoyin Li Xuemin Wang Gunther RE. Scherera | 2013 | Molecular Plant2013，6，5： | 2 |
| 7 | Saliency detection and edge feature matching approach for crater extraction显示文摘Craters are salient terrain features on planetary surfaces, and provide useful information about the relative dating of geological unit of planets. In addition, they are ideal landmarks for spacecraft navigation. Due to low contrast and uneven illumination, automatic extraction of craters remains a challenging task. This paper presents a saliency detection method for crater edges and a feature matching algorithm based on edges information. The craters are extracted through saliency edges detection,edge extraction and selection, feature matching of the same crater edges and robust ellipse fitting. In the edges matching algorithm,a crater feature model is proposed by analyzing the relationship between highlight region edges and shadow region ones. Then,crater edges are paired through the effective matching algorithm.Experiments of real planetary images show that the proposed approach is robust to different lights and topographies, and the detection rate is larger than 90%. | An Liu Donghua Zhou Lixin Chen Maoyin Chen | 2015 | Journal of Systems Engineering and Electronics2015，26，6： | 2 |
| 8 | Remaining useful life prediction for multi-component systems with hidden dependencies显示文摘How can we predict the remaining useful life(RUL) of a dynamic system subject to multiple dependent degradations? Is it possible to address the above problem when the degradation information is obtained indirectly? According to a new type of state space-based model, we mainly develop an online RUL prediction method for the above system. In this model, the dependencies among different degradations can be reflected in a diffusion coefficient matrix. Considering that some industrial systems like blast furnaces are usually equipped with multi-sensors, an efficient information fusion strategy also plays an important role in predicting the RUL. Based on multi-dimensional observations, the hidden degradation states are identified through the sequential Kalman filtering. Meanwhile, the unknown parameters in the model are updated iteratively by the expectation maximization(EM) algorithm. At last, the RUL distributions are simulated through the Monte Carlo method, in which three types of failure structures with regard to the degradations are considered. The effectiveness of the proposed method is fully verified by a numerical example as well as a case study about the blast furnace. | Xiaopeng XI Maoyin CHEN Donghua ZHOU | 2019 | Science China(Information Sciences)2019，62，2： | 2 |
| 9 | Nonlinear feedback control of Lorenz system显示文摘 | CHEN Maoyin ZHOU Donghua SHANG Yun | 2004 | Chaos Solitons and Fractals2004，21，2： | 1 |
| 10 | Controlling and synchronizing chaotic Genesio system via nonlinear feedback control显示文摘 | Maoyin Chen Zhengzhi Han | 2003 | Chaos Solitons & Fractals2003，17，4： | 1 |
| 11 | A new observer-based synchronization scheme for private communication显示文摘 | Chen Maoyin Zhou Donghua Shang Yun | 2005 | Chaos Solitons & Fractals2005，24，4： | 1 |
| 12 | Synchronization in complex dynamical networks with random sensor delay 显示文摘 | CHEN Maoyin | 2010 | IEEE Transaction on Circuits and Systems I12010，57，1： | 1 |
| 13 | Condition-based switching and replacement policies for a two-unit warm standby redundant system subject to non-instantaneous switchover显示文摘This study investigates condition-based switching and replacement policies for a two-unit warm standby redundant system subject to non-instantaneous switchover. The system consists of two identical units: one is operating unit, while the other is standby unit. Two units are under continuous monitoring and degradation described by Gamma processes. Both switching and replacement policies are based on the degradation level of the operating unit. The switching and replacement thresholds are decision variables decided by minimizing the long-run expected cost rate. We first setup the mathematical optimization model and then analyze the global optimal solution of replacement threshold, as well as the existence and uniqueness condition for the local optimal solution of switching threshold(STH). Finally, we find that the optimal replacement threshold is ‘‘the bigger the better'', but the optimal STH depends on some optimal conditions which can be easily computed. Numerical examples are provided to verify the policies, and the effects of noninstantaneous switchover and cost ratio on optimal STHs are numerically discussed. | Yunpeng Jiang Maoyin Chen Donghua Zhou | 2014 | Chinese Science Bulletin2014，59，33： | 1 |
| 14 | Joint optimization of preventive maintenance and inventory policies for multi-unit systems subject to deteriorating spare part inventory显示文摘 | Yunpeng Jiang Maoyin Chen Donghua Zhou | 2015 | Journal of Manufacturing Systems2015，，： | 1 |
| 15 | Sin- gle and multi-core configurable AES architecture for flexible security 显示文摘 | Wang Maoyin Su Chihpin Hong Chialung | 2010 | 1EEE Transactions on Very Large Scale Integration (VLSI) Systems2010，18，4： | 1 |
| 16 | Joint optimization of preventive maintenance and inventory policies for multi-unit systems subject to deteriorating spare part inventory显示文摘 | Jiang Yunpeng Chen Maoyin Zhou Donghua | 2015 | Journal of ManufacturingSystems2015，35，： | 1 |
| 17 | Stochastic process-based degradation modeling and RUL prediction:from Brownian motion to fractional Brownian motion显示文摘Brownian motion(BM)has been widely used for degradation modeling and remaining useful life(RUL)prediction,but it is essentially Markovian.This implies that the future state in a BM-based degradation process relies only on its current state,independent of the past states.However,some practical industrial devices such as Li-ion batteries,ball bearings,turbofans,and blast furnace walls show degradations with long-range dependence(LRD),where the future degradation states depend on both the current and past degradation states.This type of degradation naturally brings two interesting problems,that is,how to model the degradations and how to predict their RULs.Recently,in contrast to the work that uses only BM,fractional Brownian motion(FBM)is introduced to model practical degradations.The most important feature of the FBM-based degradation models is the ability to characterize the non-Markovian degradations with LRD.Although FBM is an extension of BM,it is neither a Markovian process nor a semimartingale.Therefore,how to obtain the first passage time of an FBM-based degradation process has become a challenging task.In this paper,a review of the transition of RUL prediction from BM to FBM is provided.The peculiarities of FBM when addressing the LRD inherent in some practical degradations are discussed.We first review the BM-based degradation models of the past few decades and then give details regarding the evolution of FBM-based research.Interestingly,the existing BM-based models scarcely consider the effect of LRD on the prediction of RULs.Two practical cases illustrate that the newly developed FBMbased models are more generalized and suitable for predicting RULs than the BM-based models,especially for degradations with LRD.Along with the direction of FBM-based RUL prediction,we also introduce some important and interesting problems that require further study. | Hanwen ZHANG Maoyin CHEN Jun SHANG Chunjie YANG Youxian SUN | 2021 | Science China(Information Sciences)2021，64，7： | 1 |
| 18 | A new observer-based synchronization scheme for private communication 显示文摘 | CHEN MAOYIN ZHOU DONGHUA SHANG YUN | 2005 | Chaos Solitons and Fractals2005，24，4： | 1 |
| 19 | Maintaining partially observed systems with imperfect observation and resource constraint显示文摘 | Chen Maoyin Fan Hongdong Hu Changhua | 2014 | IEEE Trans- actions on Reliability2014，63，4： | 1 |
| 20 | A simple time-delayed method to comtrol chaotic systems显示文摘 | Maoyin Chen Donghua Zhou Yun Shang | 2004 | Chaos Solitons and Fractals2004，22，： | 1 |
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