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Impact of Plant Density on the Formation of Potato Mimitubers Derived from Microtubers and Tip-Cuttings in Plastic Houses

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Journal of Integrative Agriculture 2013年第6期12卷 1008-1017页

作者： JIN Hui LIU Jun SONG Bo-tao xie cong-hua Key Laboratory of Horticultural Plant Biology Ministry of Education/Potato Engineering Research Center of Hubei Province Huazhong Agricultural University

The potato minitubers have been widely used for the elite seed propagation to improve the seed potato system in China. However, little information is available for an efficient production of the minitubers with high plant density in the protected growing conditions like plastic houses. In present research, the minitubers of a wide-grown potato variety, Favorita, were produced with the microtubers from tissue culture and the tip-cuttings of the microtuber plants. Three plant densities, 200, 400 and 600 microtubers or plants m-2 were set up with the randomized block design of 3 replications and the experiment was repeated in 4 seasons in 2009-2010. The canopy development, light interception, dry weight production and partitioning, tuberization and tuber weight were investigated to elucidate the mechanism by which the plant density affects the formation and growth of the minitubers. The results showed that the number of the tubers formed per unite area was in line with the increase in plant density. The difference in leaf area index （LAI） between the plant densities, especially in early stage of the plant growth, resulted in more radiation interception and dry weight producing in higher plant density than in lower one. However, our analysis demonstrated that the conversion coefficient of the cumulative intercepted radiation to plant weight and the dry weight partition rate to the tubers were constant between plant densities, suggesting that less amount of the photoassimilates partitioned to individual tubers is causal for more small tubers in high plant density. A negative exponential curve model, determined by total number of tubers produced per unit area and the mean tuber weight, fitted well to the tuber size distribution pattern. The optimum plant density could be estimated from this model for a maximum production of the minitubers with desired size.

关键词： potato minituber microtuber tip-cutting plant density

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Research on Algorithm for Mining Negative Association Rules Based on Frequent Pattern Tree

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Wuhan University Journal of Natural Sciences 2006年第1期11卷 37-41页

作者： ZHU Yu-quan YANG He-biao SONG Yu-qing xie cong-hua School of Computer Science and Communication Engineering Jiangsu University Zhenjiang 212013 JiangsuChina

Typical association rules consider only items enumerated in transactions. Such rules are referred to as positive association rules. Negative association rules also consider the same items, but in addition consider negated items （i. e. absent from transactions）. Negative association rules are useful in market-basket analysis to identify products that conflict with each other or products that complement each other. They are also very convenient for associative classifiers, classifiers that build their classification model based on association rules. Indeed, mining for such rules necessitates the examination of an exponentially large search space. Despite their usefulness, very few algorithms to mine them have been proposed to date. In this paper, an algorithm based on FP tree is presented to discover negative association rules.

关键词： data mining FP-tree Negative Association Rules

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Population Improvement of Resistance to Late Blight in Tetraploid Potato:A Case Study in Combination with AFLP Marker Assisted Background Selection

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Agricultural Sciences in China 2011年第8期10卷 1177-1187页

作者： YAO Chun-guang SONG Bo-tao LIU Jun WU Cheng-jin CHENG Qun LI Da-chun xie cong-hua Key Laboratory of Horticultural Plant Biology Ministry of Education/National Center for Vegetable Improvement （Central China）/Potato Engineering and Technology Research Center of Hubei Province/Huazhong Agricultural UniversityWuhan 430070P.R.China Southern Potato Research Center of China/Enshi Academy of Agricultural Sciences Enshi 445000P.R.China

Cultivated potato with high level of horizontal resistance against late blight is one of the most important goals of potato *** recurrent selection has been adopted to increase the level of potato horizontal resistance and a B3C1 population without R1-R11 dominant genes has been released by the International Potato Center at the short-day condition of *** present research was carried out to further improve the resistance and the agronomic traits of B3C1 population under long-day condition of Hubei,China,with maximized retention of its genetic ***-seven individual clones of B3C1 were used to generate population B3C2 by in-population crossing with the bulk pollens aiming to elevate the frequency of late blight resistance genotypes and to improve the adaptation to local long-day *** late blight resistance and the main agronomic traits including the maturity,the plant characters and the tuber traits were evaluated for the foreground selection in three years,by which 130 pedigrees were maintained as the basic population of B3C2 for further selection.A total of 312 polymorphic loci detected by 9 AFLP marker combinations were used to monitor the genetic diversity of the populations for the background *** B3C2 population of 51 clones was finally selected,of which the frequency of resistant genotypes increased by 23.8% points and the genetic diversity was maintained by about 96% as referred to *** results strongly suggested that combination of the foreground selection for target traits and the background selection for the genetic diversity is an efficient strategy in the recurrent selection of tetraploid potato to improve quantitative traits.

关键词： potato recurrent selection late blight horizontal resistance genetic diversity

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Reliability of a Multicomponent Stress-strength Model Based on a Bivariate Kumaraswamy Distribution with Censored Data

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 478-507页

作者： cong-hua CHENG School of Mathematics and Statistics Zhaoqing UniversityZhaoqing 526061China

In this paper,we consider a system which has k statistically independent and identically distributed strength components and each component is constructed by a pair of statistically dependent elements with doubly type-II censored *** elements(X1,Y1),(X2,Y2),…,(Xk,Yk)follow a bivariate Kumaraswamy distribution and each element is exposed to a common random stress T which follows a Kumaraswamy *** system is regarded as operating only if at least s out of k(1≤s≤k)strength variables exceed the random *** multicomponent reliability of the system is given by Rs,k=P(at least s of the(Z1,…,Zk)exceed T)where Zi=min(Xi,Yi),i=1,…,*** Bayes estimates of Rs,k have been developed by using the Markov Chain Monte Carlo methods due to the lack of explicit *** uniformly minimum variance unbiased and exact Bayes estimates of Rs,k are obtained analytically when the common second shape parameter is *** asymptotic confidence interval and the highest probability density credible interval are constructed for Rs,*** reliability estimators are compared by using the estimated risks through Monte Carlo simulations.

关键词： stress-strength model bivariate Kumaraswamy distribution multicomponent reliability doubly Type-II censored scheme interval estimation

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Navigating Epstein–Barr virus autoimmunity:role of NK cells and T cells in multiple sclerosis

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Signal Transduction and Targeted Therapy 2024年第3期9卷 833-835页

作者： Chu xie cong Sun Mu-Sheng Zeng State Key Laboratory of Oncology in South China Guangdong Provincial Clinical Research Center for CancerGuangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and TherapySun Yat-sen University Cancer CenterGuangzhouP.R.China

In a recent study published in Cell,Vietzen and colleagues discovered the novel role of natural killer(NK)cells and EBVspecific CD8+T cell response in controlling EBV-inducing autoimmune response and collectively def... 详细信息

关键词： Epstein sclerosis killer

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Anti-saturation fault-tolerant adaptive torsional vibration control with fixed-time prescribed performance for rolling mill main drive system

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Journal of Iron and Steel Research International 2024年第3期31卷 660-669页

作者： Shuang Liu Chen Du cong Zhang Zhen-hua Bai Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan UniversityQinhuangdao 066004HebeiChina National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004HebeiChina

An anti-saturation fault-tolerant adaptive torsional vibration control method with fixed-time prescribed performance for the rolling mill main drive system(RMMDS)was investigated,which is affected by control input saturation,actuator faults,sensor measurement errors,and parameter ***,we gave a continuously differentiable saturation function to approximate the control input saturation characteristic of the RMMDS,translating the saturation characteristic into the matched uncertainty and unknown time-varying gain in the ***,an RMMDS mathematical model with unmatched uncertainty and unknown time-varying gain was developed,taking into account the presence of control input saturation,actuator faults,sensor measurement errors,and parameter *** on the established mathematical model,an error transformation model of the roll speed tracking was constructed by the equivalent error transformation *** to the error transformation model,a barrier Lyapunov function and a novel adaptive controller were studied to ensure that the roll speed tracking error always evolves inside a fixed-time asymmetric ***,numerical simulations were performed in Matlab/Simulink to verify the effectiveness and superiority of the proposed control method in suppressing the RMMDS torsional vibration.

关键词： Fixed-time prescribed performance Control input saturation Actuator fault Unknown time-varying gain Adaptive control Asymmetric constraint

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马铃薯蛋白激酶基因StPK1启动子的克隆及活性分析

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中国农业科学 2011年第5期44卷 867-873页

作者：吴田谢从华西南林业大学园林学院华中农业大学园艺林学学院/园艺植物生物学教育部重点实验室/国家蔬菜改良中心华中分中心/湖北省马铃薯工程技术研究中心

【目的】研究马铃薯蛋白激酶基因StPK1,为在马铃薯抗病反应中的功能提供证据。【方法】利用TAIL-PCR技术,从马铃薯晚疫病水平抗性、垂直抗性和感病等3种材料中,分别克隆了该基因的启动子区域。此外,将从水平抗性材料中克隆得到的启动子... 详细信息

【目的】研究马铃薯蛋白激酶基因StPK1,为在马铃薯抗病反应中的功能提供证据。【方法】利用TAIL-PCR技术,从马铃薯晚疫病水平抗性、垂直抗性和感病等3种材料中,分别克隆了该基因的启动子区域。此外,将从水平抗性材料中克隆得到的启动子与GUS连接构建植物表达载体,通过农杆菌介导的遗传转化法转化本氏烟(Nicotiana benthamiana),将得到的转基因烟草分别用水、晚疫病原菌或水杨酸(SA)溶液处理,并进行表达活性分析。【结果】3个启动子长度分别为922、929和922 bp,均具有TATA-box和CAAT-box以及多种与抗病反应和基因时空表达有关的元件,而三者的主要差异是个别碱基的不同。GUS组织化学染色表明,用晚疫病原菌或SA处理的转基因烟草被染成蓝色。【结论】StPK1启动子为有活性的启动子,且为病原和SA诱导型启动子。

关键词：马铃薯晚疫病 StPK1启动子 TAIL-PCR

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Multi-performance evaluation of high-throughput accelerated corrosion test for high-strength low-alloy 921A steel

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Journal of Iron and Steel Research International 2024年第5期31卷 1260-1278页

作者： cong-cong Du Ming-hua Qin Zhan-fang Wu Dong-ling Li Lei Zhao Xiang-yang Li Hai-zhou Wang Beijing Advanced Innovation Center for Materials Genome Engineering National Center for Materials Service SafetyUniversity of Science and Technology BeijingBeijing100083China China Iron and Steel Research Institute Group Co. Ltd.Beijing100081China Beijing Advanced Innovation Center for Materials Genome Engineering Central Iron and Steel Research InstituteBeijing100081China

The corrosion behavior of high-strength low-alloy 921A steel in a simulated marine atmospheric environment was studied using a high-throughput experimental *** corrosion behavior,corrosion morphology,and corrosion products of 921A steels were analyzed using various techniques,including corrosion mass loss method,polarization curve,white-light interferometry,scanning electron microscopy,energy-dispersive spectrometry,microbeam X-ray fluorescence spectrometry,X-ray diffraction technique,and X-ray photoelectron *** test results indicated that 921A steel exhibits better corrosion resistance than Q450NQR1 steel in simulated harsh atmospheric environments,as evidenced by a lower corrosion mass loss rate throughout the corrosion *** corrosion products of both steels consisted ofα-FeOOH,Fe_(3)O_(4),andγ-FeOOH,withα-FeOOH being more prevalent in the rust layer of 921A steel than in Q450NQR1 *** inner rust layer of 921A steel also exhibited an appositional enrichment region of Cr,Ni,Mo,and V,leading to its superior corrosion resistance compared to that of Q450NQR1 *** efficacy of high-throughput accelerated corrosion experimental methods was highlighted for evaluating the corrosion resistance of steel materials in harsh environmental *** findings suggest that 921A steel exhibits better corrosion resistance compared to Q450NQR1 steel and has the potential to be more suitable in harsh marine atmospheric *** characterization of the rust layer structures and composition reveals the parallel enrichment of certain elements in the inner rust layer of 921A steel,which enhances its corrosion resistance.

关键词： Atmospheric corrosion High-throughput experimental method High-strength low-alloy steel Corrosion characteristics Rust layer Element enrichment

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Convergence analysis for complementary-label learning with kernel ridge regression

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Applied Mathematics(A Journal of Chinese Universities) 2024年第3期39卷 533-544页

作者： NIE Wei-lin WANG Cheng xie Zhong-hua School of Mathematics and Statistics Huizhou UniversityHuizhou 516007China School of Computer Science and Engineering Huizhou UniversityHuizhou 516007China

Complementary-label learning(CLL)aims at finding a classifier via samples with complementary *** data is considered to contain less information than ordinary-label *** transition matrix between the true label and the complementary label,and some loss functions have been developed to handle this *** this paper,we show that CLL can be transformed into ordinary classification under some mild conditions,which indicates that the complementary labels can supply enough information in most *** an example,an extensive misclassification error analysis was performed for the Kernel Ridge Regression(KRR)method applied to multiple complementary-label learning(MCLL),which demonstrates its superior performance compared to existing approaches.

关键词： multiple complementary-label learning partial label learning error analysis reproducing kernel Hilbert spaces

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成软骨细胞瘤骨膜反应的影像特点

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中国医学影像技术 2008年第2期24卷 264-266页

作者：谢元忠谢丛华武汉大学中南医院放化疗科湖北武汉430071

目的分析成软骨细胞瘤骨膜反应的X线及CT表现特点,探讨其诊断价值。方法对39例成软骨细胞瘤的X线平片及CT资料进行回顾性分析研究,重点分析其骨膜反应的部位、形态及范围。结果39例中24例出现骨膜反应,在平片上8例位于干骺端的两侧,CT... 详细信息

目的分析成软骨细胞瘤骨膜反应的X线及CT表现特点,探讨其诊断价值。方法对39例成软骨细胞瘤的X线平片及CT资料进行回顾性分析研究,重点分析其骨膜反应的部位、形态及范围。结果39例中24例出现骨膜反应,在平片上8例位于干骺端的两侧,CT上见环绕骨皮质周围,较广泛。5例骨膜反应与皮质断裂处有一间隔距离;3例位于皮质断裂处的对侧。5例骨膜反应很广泛,在CT上呈不规则的广泛花边状改变。7例伴有周围软组织肿胀。结论成软骨细胞瘤骨膜反应广泛,形态多样,与病灶部位及病灶的良性形态不相称;这一征象对本病的诊断与鉴别诊断具有重要价值。

关键词：成软骨细胞瘤骨膜反应放射学

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