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Journal of Iron and Steel Research International 2024年第3期31卷 622-633页

作者： Pu Wang Liang Chen Qun-wei Tang Wei-tao Li Shao-xiang Li Jia-quan Zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Weifang Special Steel Group Co..Ltd. Weifang 262400ShandongChina School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

The propagation form of internal cracks induced by continuous casting soft reduction and the control strategy for enhancing the internal quality of 45 steel through industrial trials and a three-dimensional flow-heat transfer-solidification coupling model were *** results showed that the internal cracks induced by soft reduction exhibited a characteristic of being"coarse in the middle and fine at both ends",and displayed an elliptical arc distribution on the loose side of the strand cross *** cracks originated within the brittle temperature range and propagated inward to the liquid impenetrable temperature and outward to the zero ductility temperature or *** control strategy for enhancing the internal quality of the 45 steel strand through soft reduction is to adjust the casting speed or the reduction zone appropriately,ensuring that the central solid fraction of the reduction zone falls within the range of *** this point,a reasonable reduction amount is allocated to eliminate the center shrinkage cavities and center segregation,even if it results in minor reduction-induced cracks.

关键词： Continuous casting Soft reduction Crack propagation internal quality Control strategy

Prediction of Newhall navel orange internal quality based on digital microscopy

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International Journal of Agricultural and Biological Engineering 2021年第6期14卷 222-227页

作者： Shumin Gao Cong Cao Dingyi Hu Rangwei Xu Yunjiang Cheng Hong Chen Ming Zhu Shanjun Li College of Engineering Huazhong Agricultural UniversityWuhan 430070China Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River Ministry of Agriculture and Rural AffairsWuhan 430070China National R&D Center for Citrus Preservation Huazhong Agricultural UniversityWuhan 430070China Nanfang College of Sun Yat-sen University Guangzhou 510970China College of horticulture&forestry sciences Huazhong Agricultural UniversityWuhan 430070China Citrus Mechanization Research Base Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan 430070China

The traditional technology for internal quality detection of citrus fruit is believed to be destructive,inefficient,and *** address these issues,a novel method has been developed to evaluate nondestructively the sugar-acid ratio(SAR)of soluble solids by using the oil glands density(OGD).In this study,a total of 584 samples with different widths were *** sample data were correlated that the SAR and OGD decreased with time during *** relevance with time was significant between SAR and OGD of citrus positively correlated in the calibration group(R2=0.82),which indicated that OGD could be used to predict the internal quality of *** indicated that a new generation of digital microscopy could provide an alternative to predict nondestructively the internal quality of citrus fruit,as well as some theoretical insight for further studies of online quality detection in the future.

关键词： citrus nondestructive oil glands internal quality storage microscopy

Rapid and nondestructive detection of watercore and sugar content in Asian pear by near infrared spectroscopy for commercial trade

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Journal of Innovative Optical Health Sciences 2014年第6期7卷 9-15页

作者： Ronnarit Rittiron Sureeporn Narongwongwattana Unaruj Boonprakob Worapa Seehalak Department of Food Engineering Faculty of Engineering at Kamphaengsaen Kasetsart UniversityNakhonpathomThailand Department of Horticulture Faculty of Agriculture at Kamphaengsaen Kasetsart UniversityNakhonpathomThailand

Watercore and sugar content are internal qualities which are impossible for exterior *** the aims of this study were to develop models for nondestructive detection of watercore and predicting sugar content in pear using Near Infrared Spectrosoopy(NIR)tech-nique.A total of 93 samples of Asian pear variety“SH-078”were *** sugar content,spectrum of each fruit was measured in the short wavelength region(700-1100nm)in the reflection mode and the first derivative of spectra were then correlated with the sugar content in juice determined by digital *** equation was performed by multiple linear *** result showed Standard Error of Prediction(SEP)=0.58°Bx,and Bias=*** result from t-test showed that sugar content predicted by NIR was not signifcantly different from the value analyzed by refractometer at 95%*** watercore disorder,NIR measurement was performed over the short wavelength range(700-850 nm)in the transmission *** first derivative spectra were correlated with intemnal *** principle com-ponent analysis(PCA)and partial least squares discriminant analysis(PLSDA)were used to perform discrimination *** accuracy of the PCA model was greater than the PLSDA *** scores from PC1 were separated into two boundaries,one predicted rejected pears with 100%classification accuracy,and the other was accepted pears with 92%*** high accuracy of sugar content determining and watercore detecting by NIR reveal the high efficiency of NIR technique for detecting other internal qualities of fruit in the future.

关键词： NIR internal quality damage calibration model

Dynamic Soft Reduction for Continuously Cast Rail Bloom

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Journal of Iron and Steel Research International 2007年第5期14卷 13-17,51页

作者： CHEN Yong LI Gui-jun YANG Su-bo ZHU Miao-yong School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China Department of Material Research Panzhihua Iron and Steel Research Institute Panzhihua 617000 Sichuan China Vanadium Recovery andSteelmaking Plant Panzhihua New Steel and Vanadium Co Ltd Panzhihua 617062 Sichuan China

Center porosity and centerline segregation in continuously cast bloom can be minimized by the well-known method of dynamic soft reduction. Metallurgical results of soft reduction previously employed in continuous bloom casting for heavy rail steel in Panzhihua Iron and Steel Group were not fully achieved because of the improper soft reduction process. Therefore, experiments for optimizing the process parameters of soft reduction for bloom were carried out. The results show that the proportion of the center porosity, which is less than 1.0, increases from 28.41% to 99.81%, while the proportion of the centerline segregation class increases from 40.91% to 100%, and the proportion of the central cavity increases from 92.05% to 100%, whereas the center carbon segregation index decreases from 1.17 to 1.05. The internal quality and the mechanical performance of the rails produced from continuously cast blooms meet the requirement of high-speed tracks of 350 km/h.

关键词： continuous bloom casting dynamic soft reduction rail steel internal quality

Nondestructive methods for determining the firmness of apple fruit flesh

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Information Processing in Agriculture 2021年第4期8卷 515-527页

作者： Zahed Fathizadeh Mohammad Aboonajmi Seyed Reza Hassan-Beygi Department of Agrotechnology College of AbouraihanUniversity of TehranTehranIran

Nowadays,many researches have been accomplished on the attributed quality assessment of agricultural *** have significantly contributed to these researches because of their high production and consumption,*** this paper,the nondestructive instrumental researches in the field of firmness assessment for apple fruit *** researches are important for all production and distribution chain activists such as farmers,insurance companies,packaging and transportation companies,wholesalers and *** studies can be used for examining texture quality,predicting the right time to harvest fruits and classifying them according to the level of ripeness and detecting the apparent and internal defects of the *** apple flesh firmness measurement methods consist of acoustic and mechanical vibration methods,optical methods such as hyperspectral scattering imaging,near infrared,ultrasound and other *** destructive puncture test method commonly used as a reference *** methods are accurate and quick that is suitable for online ***,the use of artificial intelligence methods and data fusion techniques to increase the accuracy of quality measuring of the products has been considered that in the future we will see further development of these methods in measuring the firmness of the apples.

关键词： Apple Firmness internal quality Nondestructive

Dynamic Soft Reduction Technology for Bloom Casting

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Journal of Iron and Steel Research International 2010年第6期17卷 1-5页

作者： CHEN Yong XIAO Ming-fu WU Guo-rong Research Institute Co Ltd Pangang Group Chengdu 611731 Sichuan China Vanadium Recovery and Steelmaking Plant Panzhihua Steel and Vanadium Co Ltd Pangang Group Panzhihua 617062 Sichuan China

The dynamic soft reduction technology for 360 mm×450 mm bloom casting and its application results at Panzhihua Iron and Steel Co （PISCO） were presented. In order to analyze the influence of the soft reduction on internal defects of bloom, such as center porosity and central segregation, experiment for contrasting process with or without soft reduction for bloom was conducted. The operation shows that after applying the soft reduction of alloy steel 45CrMnMo bloom, the ratio of center porosity whose defect level is less than or equal to 1.0 increased from 66.67% to 85.71%, ratio of central segregation whose defect level is below 1.0 increased from 94.44% to 100%, ratio of central shrinkage cavity which is free increased from 88.89% to 96.42%, and central segregation index of carbon decreased from mean value of 1.15 to 1.05.

关键词： continuous casting bloom dynamic soft reduction alloy steel internal quality