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西兰花苗中萝卜硫素合成的调控手段研究进展

食品科学 2025年第1期46卷 210-217页

作者：李翠方胜赵忠良刘海杰中国农业大学食品科学与营养工程学院北京100083 江苏新希望生态科技有限公司江苏徐州221150

萝卜硫素(sulforaphane,SFN)具有抗肿瘤、抗炎、抗氧化、减轻肥胖等多种生物学活性,在西兰花苗中含量最高,使西兰花苗在保健食品和药品开发方面具有广阔的应用前景。本文首先综述SFN在西兰花苗中的合成及降解过程,重点讨论在西兰花苗生... 详细信息

萝卜硫素(sulforaphane,SFN)具有抗肿瘤、抗炎、抗氧化、减轻肥胖等多种生物学活性,在西兰花苗中含量最高,使西兰花苗在保健食品和药品开发方面具有广阔的应用前景。本文首先综述SFN在西兰花苗中的合成及降解过程,重点讨论在西兰花苗生长阶段采用不同处理手段对SFN及其合成相关因子含量的影响,并对其作用机理进行总结分析,最后提出目前还存在的问题及对未来研究方向的展望,为提高植物源食品功能性的相关研究提供一定参考。

关键词：西兰花苗硫代葡萄糖苷萝卜硫素生成机理调控

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双壁波纹钢管混凝土构件短柱轴压力学性能

哈尔滨工业大学学报 2025年第1期57卷 56-64页

作者：路博崔燕方勇王玉银李豪哈尔滨工业大学土木工程学院哈尔滨150090 结构工程灾变与控制教育部重点实验室(哈尔滨工业大学) 哈尔滨150090 深圳市市政设计研究院有限公司广东深圳518029

为改善空心钢筋混凝土柱(HRC)的使用与受力性能,提出一种双壁波纹钢管混凝土(CFDCST)构件。本文共进行了4个大尺寸双壁波纹钢管混凝土短柱与2个空心钢筋混凝土短柱的轴压试验,关键试验参数为试件类型与波纹钢管类型。分析构件的破坏模式... 详细信息

为改善空心钢筋混凝土柱(HRC)的使用与受力性能,提出一种双壁波纹钢管混凝土(CFDCST)构件。本文共进行了4个大尺寸双壁波纹钢管混凝土短柱与2个空心钢筋混凝土短柱的轴压试验,关键试验参数为试件类型与波纹钢管类型。分析构件的破坏模式,对比不同参数下构件的承载力、峰值应变、延性系数等关键力学指标,获得荷载-波纹钢管应变关系曲线以揭示试件的约束机理并验证外波纹钢管类型的影响。试验结果表明:外波纹钢管可为夹层混凝土提供约束作用,且螺旋角越小,外波纹钢管的约束作用越强;内波纹钢管则主要为夹层混凝土内壁提供有效支撑,以保持截面的完整性。名义约束效应系数与空心率相近时,由于咬口滑移影响,大螺旋角双壁波纹钢管混凝土比小螺旋角双壁波纹钢管混凝土的峰值应力、峰值应变与延性系数分别降低15.5%、21.8%与16.7%。在总用钢量相近的情况下,小螺旋角双壁波纹钢管混凝土柱的承载力、峰值应变与延性系数分别比空心钢筋混凝土柱提高10.6%、36.2%与50.0%。基于试验结果,检验了3种典型承载力公式的适用性,并提出了相应设计建议。

关键词：组合结构空心钢筋混凝土波纹钢管双壁构件约束机理

Analytical Model of Day-ahead and Real-time Price Correlation in Strategic Wind Power Offering

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Journal of Modern Power Systems and Clean Energy 2020年第5期8卷 1024-1027页

作者： Xin Fang Mingjian cui Department of Electrical Engineering and Computer Science University of TennesseeKnoxvilleTN 37996USA Department of Electrical Engineering and Computer Science Southern Methodist UniversityDallasTX 75205USA

In this paper,the model of strategic wind power offering in the day-ahead(DA)market is proposed considering the uncertainties of wind power production,and price forecasting of DA and real-time(RT)*** wind power deviation in the RT market is settled with the two-price mechanism based on the deviation direction and the relation between the locational marginal prices(LMPs)of DA and *** of using the point forecasting for the DA and RT LMPs,the uncertainties of LMP forecasting are *** addition,the correlation between the forecasting errors of DA and RT LMP are directly modeled instead of generating the correlated ***,the opitmal offered quantity of wind power in the DA market is derived using the probability theory based on the probabilistic wind power *** case study using the price data of actual DA and RT from Midcontinent Independent System Operator(MISO)validates the effectiveness of the proposed *** shows that the correlation of the forecasting errors of DA and RT LMP has a significant impact on the wind power quantity offered by DA and revenue results.

关键词： Electricity market wind power uncertainty correlation strategic wind power offering

RISK-SENSITIVE FIXED-POINT SMOOTHING ESTIMATION FOR LINEAR DISCRETE-TIME SYSTEMS WITH MULTIPLE OUTPUT DELAYS

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Journal of Systems Science & Complexity 2013年第2期26卷 137-150页

作者： ZHAO Hongguo cui Peng Postdoctoral Research Station of School of Mathematics Shandong University School of Information Science and Technology Taishan University School of Control Science and Engineering Shandong University

This paper investigates the risk-sensitive fixed-point smoothing estimation for hnear omcrete-time systems with multiple time-delay measurements. The problem considered can be converted into an optimization one in indefinite space. Then the risk-sensitive fixed-point smoother is obtained by solving the optimization problem via innovation analysis theory in indefinite space. Necessary and sufficient conditions guaranteeing the existence of the risk-sensitive smoother are also given when the risk-sensitive parameter is negative. Compared with the conventional approach, a significant advantage of presented approach is that it provides less computational cost.

关键词： Innovation Riccati equation risk-sensitive time-delay.

Skew-gradient representations of constrained mechanical systems

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Applied Mathematics and Mechanics(English Edition) 2015年第7期36卷 873-882页

作者： Fengxiang MEI Jinchao cui School of Aerospace Engineering Beijing Institute of Technology School of Science Jiangnan University

The characteristics of stationary and non-stationary skew-gradient systems are studied. The skew-gradient representations of holonomic systems, Birkhoffian systems, generalized Birkhoffian systems, and generalized Hamiltonian systems are given. The characteristics of skew-gradient systems are used to study integration and stability of the solution of constrained mechanical systems. Examples are given to illustrate applications of the result.

关键词： constrained mechanical system skew-gradient system integration stability

A novel fluid catalytic cracking process for maximizing /so-paraffins： From fundamentals to commercialization

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Frontiers of Chemical Science and Engineering 2018年第1期12卷 9-23页

作者： Youhao Xu Shouye cui Research Institute of Petroleum Processing (RIPP) Sinopec Beijing 100083 China

The maximizing iso-paraffins （MIP） developed by RIPP has improved gasoline quality to meet the demand of motor gasoline specification. A concept that two different reaction zones include cracking zone and conversion zone is proposed as the fundamental of MIP by research on fluid catalytic cracking （FCC） reaction chemistry. Based on the concept, the MIP process is featured by applying a novel sequential two-zone riser in conjunction with proprietary catalyst and engineering technique. The developed MIP process can not only improve gasoline yield or gasoline plus propylene yields but also produce gasoline with a higher content of iso- paraffins and a lower content of sulfur. Aminimum octane number loss is achieved when MIP gasoline is treated by downstream desulfurization technology （RSDS/S Zorb）. The combination of MIP and RSDS/S Zorb processes creates a very competitive route, which is different from the technical route used by other developed countries, to upgrade the quality of motor gasoline with the lowest economic costs in China. In just one decade, the processing capacity of MIP units has accounted for about 60% of the domestic total processing capacity of FCC units. The MIP process is gradually becoming a new generation of FCC technology.

关键词： gasoline iso-paraffins FCC desulfurization octane number

Microstructure and abrasive wear resistance of an alloyed ductile iron subjected to deep cryogenic and austempering treatments

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Journal of Materials Science & Technology 2017年第12期33卷 1549-1554页

作者： Junjun cui Liqing Chen State Key Laboratory of Rolling and Automation Northeastern University College of Mechanical and Vehicle Engineering Shenyang Institute of Technology

To further improve the mechanical performance of a new alloyed austempered ductile iron（ADI）, deep cryogenic treatment（DCT） has been adopted to investigate the effect of DCT time on the microstructure and mechanical behaviors of the alloyed ADI Fe-3.55 C-1.97 Si-3.79 Ni-0.71 Cu-0.92 Mo-0.64 Cr-0.36 Mn-0.30 V（in wt.%）. With increasing the DCT time, more austenite transformed to martensite and very fine carbides precipitated in martensite in the extended period of DCT. The amount of austenite decreased in alloyed ductile irons, while that of martensite and carbide precipitation increased. The alloyed ADI after DCT for 6 h had the highest hardness and compressive strength, which can be attributed to the formation of more plate-like martensite and the finely precipitated carbides. There was a gradual decrease in hardness and compressive strength with increasing the DCT time to 12 h because of the dissolution of M3 C carbide. After tempering, there was a decrease in mechanical properties compared to the direct DCT sample, which was caused by the occurrence of Ostwald ripening of precipitated carbides. The optimum wear resistance was achieved for the alloyed ADI after DCT for 6 h. The wear mechanism of the alloyed ADI in associating with DCT is mainly consisted of micro-cutting wear and some plastic deformation wear.

关键词： Alloyed ductile iron Austempering Deep cryogenic treatment (DCT) Microstructure Mechanical properties

Application of orthogonal experimental design and Tikhonov regularization method for the identification of parameters in the casting solidification process

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Acta Metallurgica Sinica(English Letters) 2009年第1期22卷 13-21页

作者： Dashan SUI Zhenshan cui National Die ＆ Mould CAD Engineering Research Center Shanghai Jiaotong UniversityShanghai 200030 China

The inverse heat conduction method is one of methods to identify the casting simulation parameters. A new inverse method was presented according to the Tikhonov regularization theory. One appropriate regularized functional was established, and the functional was solved by the sensitivity coefficient and Newtonaphson iteration method. Moreover, the orthogonal experimental design was used to estimate the appropriate initial value and variation domain of each variable to decrease the number of iteration and improve the identification accuracy and efficiency. It illustrated a detailed case of AlSiTMg sand mold casting and the temperature measurement experiment was done. The physical properties of sand mold and the interracial heat transfer coefficient were identified at the meantime. The results indicated that the new regularization method was efficient in overcoming the ill-posedness of the inverse heat conduction problem and improving the stability and accuracy of the solutions.

关键词： Orthogonal experimental design Regularization method Parameters identification Numerical simulation

Modelling the Effect of Initial Grain Size on Dynamic Recrystallization Using a Modified Cellular Automata and a Adaptive Response Surface Method

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Journal of Materials Science & Technology 2010年第12期26卷 1063-1070页

作者： Zhaoyang Jin Zhenshan cui National Die and Mold CAD Engineering Research Center Shanghai Jiao Tong University Shanghai 200030 China School of Mechanical Engineering Yangzhou University Yangzhou 225001 China

A modified cellular automata （CA） model of dynamic recrystallization （DRX） and a flow stress-based nucleation parameter identification method have been developed. In the method, the modified CA model, which takes the role of deformation degree on nucleation behavior into consideration, is coupled with an adaptive response surface model （ARSM） to search for the optimum nucleation parameter. The DRX behavior of an oxygen free high conductivity （OFHC） copper with different initial grain sizes has been taken as an example to validate the model. Good agreement is found between the simulated and the experimental results, which demonstrates that the new method can effectively improve the simulation accuracy.

关键词： Dynamic recrystallization Cellular automata method Nucleation model Response surface method Parameter identification