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Correlation between indoor and outdoor corrosion tests for coal train body steel in a coal medium environment

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Journal of Iron and Steel Research International 2022年第9期29卷 1495-1504页

作者： Jia-liang Song Jun-hang Chen Pan Yi na-na Chen Zhao-liang Li Kui Xiao Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Corrosion and Protection Center University of Science and Technology BeijingBeijing 100083China China Electric Power Research Institute Beijing 100192China

Q345B carbon steel as well as Q450NQR1 and S500AW weathering steels were subjected to outdoor exposure corrosion tests in coal environments and indoor periodic immersion accelerated corrosion tests with a simulated coal leaching *** corrosion kinetics were studied by the weight loss method,and the corrosion morphology and corrosion product composition were observed and analyzed by scanning electron microscopy,energy-dispersive spectroscopy and X-ray ***,correlation analysis of the indoor and outdoor tests was carried out by the gray correlation analysis *** results show that the relationship between the corrosion weight loss and corrosion time of the three steels conforms to follow the exponent power *** particular,Q450NQR1 steel has the best corrosion *** types of corrosion products and the distribution of elements in the rust layer of the three steels are similar in the indoor and outdoor *** gray correlation degrees of the three steels in the indoor and outdoor tests are all greater than 0.6;thus,the two corrosion tests have a good *** on this,the accelerated simulation test method of the coal leaching solution is determined,and life prediction models of three steels in coal leaching solution are established to simulate the corrosion of the bottom board and side board.

关键词： Coal train body steel Coal environment-Corrosion Outdoor exposure test Indoor acceleration test Correlation

NN-based Output Tracking for More General Stochastic Nonlinear Systems with Unknown Control Coefficients

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International Journal of Automation and computing 2017年第3期14卷 350-359页

作者： na Duan Hui-Fang Min School of Electrical Engineering & Automation Jiangsu Normal UniversityXuzhou 221116 China

This paper considers the output tracking problem for more general classes of stochastic nonlinear systems with unknown control coefficients and driven by noise of unknown covariance. By utilizing the radial basis function neural network approximation method and backstepping technique, we successfully construct a controller to guarantee the solution process to be bounded in *** tracking error signal is 4th-moment semi-globally uniformly ultimately bounded（SGUUB） and can be regulated into a small neighborhood of the origin in probability. A simulation example is given to demonstrate the effectiveness of the control scheme.

关键词： Stochastic nonlinear systems unknown control coefficients output tracking neural networks backstepping

A Continuous State Feedback Controller Design for High-order Nonlinear Systems with Polynomial Growth Nonlinearities

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International Journal of Automation and computing 2013年第4期10卷 267-274页

作者： Guo-Dong Zhao na Duan School of Control Science and Engineering Shandong University School of Electrical Engineering and Automation Jiangsu Normal University

In this paper, we investigate the problem of global stabilization for a general class of high-order and non-smoothly stabilizable nonlinear systems with both lower-order and higher-order growth conditions. The designed continuous state feedback controller is recursively constructed to guarantee the global strong stabilization of the closed-loop system.

关键词： Nonlinear systems lower-order and high-order nonlinearities state feedback adding a power integrator global strong stabilization.

Small-divisor Equation of Higher Order with Large Variable Coefficient and Application to the Coupled KdV Equation

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Acta Mathematica Sinica,English Series 2011年第10期27卷 2005-2032页

作者： Mei na GAO Jing ZHANG School of Mathematical Sciences Fudan University Shanghai 200433 P. R. China

In this paper, we establish an estimate for the solutions of small-divisor equation of higher order with large variable coefficient. Then by formulating an infinite-dimensional KAM theorem which allows for multiple normal frequencies and unbounded perturbations, we prove that there are many periodic solutions for the coupled KdV equation subject to small Hamiltonian perturbations.

关键词： KAM theorem small-divisor equation with large variable coefficient coupled KdV equation

Study of heat transfer by using DEM–CFD method in a randomly packed pebble-bed reactor

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Nuclear Science and Techniques 2019年第2期30卷 123-134页

作者： Qiang Niu na-Xiu Wang Shanghai Institute of Applied Physics Chinese Academy of Sciences CAS Innovative Academies in TMSR Energy System Chinese Academy of Sciences University of Chinese Academy of Sciences

The pebble-bed reactor is one of the most promising designs for the nuclear energy industry. In this paper,a discrete element method-computational fluid dynamics(DEM-CFD) approach that includes thermal conduction, radiation, and natural convection mechanisms was proposed to simulate the thermal-fluid phenomena after the failure of forced circulation cooling system in a pebble-bed core. The whole large-scale packed bed was created using the DEM technique, and the calculated radial porosity of the bed was validated with empirical correlations reported by researchers. To reduce computational costs, a segment of the bed was extracted, which served as a good representative of the large-scale packed bed for CFD calculation. The temperature distributions simulated with two different fluids in this DEM-CFD approach were in good agreement with SAna experimental data. The influence of the natural convection mechanism on heat transfer must be taken into account for coolants with strong convective capacity. The proposed DEM-CFD methodology offers a computationally efficient and widely applied method for understanding the heat transfer process in a pebble-bed core. The method can also be easily extended to assess the passive safety features of newly designed fluoride-salt-cooled pebble-bed reactors.

关键词： Discrete element method Computational fluid dynamics Pebble bed Heat transfer natural convection

盐酸青藤碱抑制急性T淋巴细胞白血病CEM细胞株的作用及转录组学分析

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中国组织工程研究 2025年第31期29卷 6674-6680页

作者：康林之刘振帅魏佳旭常娜朱大诚江西中医药大学江西省南昌市330004 延安大学陕西省延安市716000

背景:盐酸青藤碱有抗多种肿瘤的作用,但目前尚不清楚盐酸青藤碱对急性T淋巴细胞白血病的作用。目的:探讨盐酸青藤碱对急性T淋巴细胞白血病CEM细胞的抑制作用。方法:应用不同浓度(0.5,1,2,4 mmol/L)盐酸青藤碱处理CEM细胞,CCK-8检测细胞... 详细信息

背景:盐酸青藤碱有抗多种肿瘤的作用,但目前尚不清楚盐酸青藤碱对急性T淋巴细胞白血病的作用。目的:探讨盐酸青藤碱对急性T淋巴细胞白血病CEM细胞的抑制作用。方法:应用不同浓度(0.5,1,2,4 mmol/L)盐酸青藤碱处理CEM细胞,CCK-8检测细胞增殖抑制率并计算IC50;倒置显微镜和吉姆萨染色观察CEM细胞形态变化;利用Rna-Seq测序分析差异基因表达并进行生物信息学分析。结合转录组测序结果,流式细胞术检测不同浓度(1,2,4 mmol/L)盐酸青藤碱作用后CEM细胞凋亡率;Western blot检测不同浓度(1,2,4 mmol/L)盐酸青藤碱作用后CEM细胞中Bcl-2、Bax、Caspase-9蛋白的表达。结果与结论:①盐酸青藤碱呈剂量和时间依赖性地抑制CEM细胞生长;②盐酸青藤碱干预后CEM细胞数量下降,核固缩;③Rna-seq测序筛出53个异常表达基因,基因本体分析主要富集在细胞过程、细胞解剖实体与粘连关系等,信号通路分析与肿瘤相关的是细胞凋亡;④盐酸青藤碱呈剂量依赖性地促进CEM细胞凋亡;⑤盐酸青藤碱上调CEM细胞中Bax、Caspase-9蛋白表达,下调Bcl-2蛋白表达。由此可见,盐酸青藤碱可诱导CEM细胞凋亡从而抑制细胞增殖,可能与其上调Bax和Caspase-9蛋白表达,以及下调Bcl-2蛋白表达有关。

关键词：盐酸青藤碱急性T淋巴细胞白血病 CEM细胞细胞凋亡 Rna-seq测序增殖抑制工程化细胞

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Effective Denoising Architecture for Handling Multiple Noises

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Computer Systems Science & Engineering 2023年第3期44卷 2667-2682页

作者： na Hyoun Kim namgyu Kim The Graduate School of Business IT of Kookmin University Seoul02707Korea

Object detection,one of the core research topics in computer vision,is extensively used in various industrial *** there have been many studies of daytime images where objects can be easily detected,there is relatively little research on nighttime *** the case of nighttime,various types of noises,such as darkness,haze,and light blur,deteriorate image ***,an appropriate process for removing noise must precede to improve object detection *** there are many studies on removing individual noise,only a few studies handle multiple noises *** this paper,we pro-pose a convolutional denoising autoencoder(CDAE)-based architecture trained on various types of *** also present various composing modules for each noise to improve object detection performance for night *** the exclusively dark(ExDark)Image dataset,experimental results show that the Sequentialfiltering architecture showed superior mean average precision(mAP)compared to other architectures.

关键词： Object detection computer vision nighttime multiple noises convolutional denoising autoencoder

A New Representation for Second Order Stochastic Integral-differential Operators and Its Applications

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Acta Mathematicae Applicatae Sinica 2015年第1期31卷 59-70页

作者： Guang-yan JIA na ZHANG Qilu Securities Institute for Financial Studies Shandong University College of Management and Economics Tianjin University China Center for Social Computing Tianjin University

In this paper, we＇ll prove new representation theorems for a kind of second order stochastic integral- differential operator by stochastic differential equations （SDEs） and backward stochastic differential equatio... 详细信息

关键词： backward stochastic differential equation with jumps representation theorem stochastic integral-differential operator f-expectation

Short-term night lighting disrupts lipid and glucose metabolism in Zebra Finches:Implication for urban stopover birds

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Avian Research 2023年第4期14卷 663-670页

作者： na Zhu Jing Shang Shuping Zhang Key Laboratory of Ecology and Environment in Minority Areas(national Ethnic Affairs Commission) Minzu University of ChinaBeijing 100081China College of Life and Environmental Sciences Minzu University of ChinaBeijing 100081China

Night lighting has been shown to affect wild *** date,the effects of night lighting on the metabolic homeostasis of birds that spend short time in urban environments remain *** model bird species Zebra Finch(Taeniopygia guttata),we investigated the effects of short-term night lighting on liver transcriptome,blood glucose,triglyceride,and thyroxine(T4 and T3)levels in birds exposed to two different night lighting duration periods(three days and six days).After three days of night lighting exposure,the expression of genes involved in fat synthesis in the liver was upregulated while the expression of genes involved in fatty acid oxidation and triglyceride decomposition was *** was also a reduction in blood triglyceride,glucose,and T3 ***,after six days of night lighting,the expression of genes associated with fatty acid decomposition and hyperglycemia in the liver was upregulated,while the expression of genes involved in fat synthesis was ***,blood glucose levels and T3 concentration *** findings indicate that short-term exposure to night lighting can disrupt the lipid and glucose metabolism of small passerine birds,and longer stopovers in urban area with intense night lighting may cause birds to consume more lipid energy.

关键词： Birds Glucose Lipid Metabolism Night lighting Short-term