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A model for converting thermal analysis to volume fraction of high carbon bearing steels during low-temperature tempering
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作者 Qinglong Liu junyu tian Wenting Wei 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第5期212-222,共11页
Quantitative prediction of phase content is of great importance to control and optimize the heat treat-ment process of steels.In this work,a model for predicting the phase content of tempered high carbon steels was pr... Quantitative prediction of phase content is of great importance to control and optimize the heat treat-ment process of steels.In this work,a model for predicting the phase content of tempered high carbon steels was proposed by taking a martensitic 100Cr6 bearing steel as a model case.The microstructural transformations during tempering were studied using thermal analysis,transmission electron microscopy(TEM),and X-ray diffraction(XRD).Kinetics analysis of thermal evolution by employing the isoconver-sional method,and assisted by TEM and XRD characterization,were performed to quantitatively estimate the volume fractions of different phases after tempering.A series of isothermal tempering experiments were designed to verify the model.The predicted results were in good agreement with the experimental results of XRD and electrolytic extraction measurements. 展开更多
关键词 Bearing steel Martensite tempering Retained austenite Thermal analysis KINETICS
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固定化尿苷-胞苷激酶和聚磷酸激酶偶联催化制备5′-胞苷酸
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作者 吴思佳 李杰 +4 位作者 胡晨龙 田俊宇 张通 陈宁 范晓光 《生物工程学报》 CAS CSCD 北大核心 2020年第5期1002-1011,共10页
尿苷-胞苷激酶作为生物体核苷酸代谢补偿途径中的重要催化剂,可以催化胞苷的磷酸化反应合成5′-胞苷酸(简称胞苷酸),但需要NTP作为磷酸供体。为了提高胞苷酸的生产效率,文中首先使用大肠杆菌分别异源表达来源于嗜热栖热菌Thermus thermo... 尿苷-胞苷激酶作为生物体核苷酸代谢补偿途径中的重要催化剂,可以催化胞苷的磷酸化反应合成5′-胞苷酸(简称胞苷酸),但需要NTP作为磷酸供体。为了提高胞苷酸的生产效率,文中首先使用大肠杆菌分别异源表达来源于嗜热栖热菌Thermus thermophiles HB8的尿苷-胞苷激酶和来源于类球红细菌Rhodobacter sphaeroides的聚磷酸激酶,其中尿苷-胞苷激酶用于催化胞苷和ATP形成胞苷酸,聚磷酸激酶则用于ATP的循环再生。然后,使用D403金属螯合树脂吸附Ni^2+形成固定化载体,再利用固定化载体特异性吸附重组酶形成固定化酶。最后,单因素优化实验确定固定化酶的催化反应条件,在30℃、pH 8.0的条件下,以60 mmol/L胞苷和0.5 mmol/L ATP为底物,可实现5批次的高效连续催化反应,胞苷酸平均摩尔得率达到91.2%。上述制备方法反应成本低,产物得率高,酶利用率高,在工业生产中具有较好的应用潜力。 展开更多
关键词 5′-胞苷酸 尿苷-胞苷激酶 聚磷酸激酶 固定化酶
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Unsupervised Style Control for Image Captioning
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作者 junyu tian Zhikun Yang Shumin Shi 《国际计算机前沿大会会议论文集》 2022年第1期413-424,共12页
We propose a novel unsupervised image captioning method.Image captioning involves two fields of deep learning,natural language processing and computer vision.The excessive pursuit ofmodel evaluation results makes the ... We propose a novel unsupervised image captioning method.Image captioning involves two fields of deep learning,natural language processing and computer vision.The excessive pursuit ofmodel evaluation results makes the caption style generated by the model too monotonous,which is difficult to meet people’s demands for vivid and stylized image captions.Therefore,we propose an image captioning model that combines text style transfer and image emotion recognition methods,with which the model can better understand images and generate controllable stylized captions.The proposed method can automatically judge the emotion contained in the image through the image emotion recognition module,better understand the image content,and control the description through the text style transfermethod,thereby generating captions thatmeet people’s expectations.To our knowledge,this is the first work to use both image emotion recognition and text style control. 展开更多
关键词 Image caption Image sentiment recognization Text style transfer
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