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期刊论文 6

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人工智能 1

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蒸汽裂解 1

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Methodological considerations for redesigning sustainable cropping systems: the value of data-mining large and detailed

Nicolas MUNIER-JOLAIN, Martin LECHENET

《农业科学与工程前沿（英文）》 2020年 第7卷 第1期   页码 21-27 doi: 10.15302/J-FASE-2019292

摘要：

Redesigning cropping and farming systems to enhance their sustainability is mainly addressed in scientific studies using experimental and modeling approaches. Large data sets collected from real farms allow for the development of innovative methods to produce generic knowledge. Data mining methods allow for the diversity of systems to be considered holistically and can take into account the diversity of production contexts to produce site-specific results. Based on the very few known studies using such methods to analyze the crop management strategies affecting pesticide use and their effect on farm performance, we advocate further investment in the development of large data sets that can support future research programs on farming system design.

关键词： data mining     holistic     Integrated Pest Management     economics     DEPHY network.    

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Concentrations of anthropogenic Pt and Pd in urban roadside soils in Xuzhou, China

WANG Xuesong, SUN Cheng

《环境科学与工程前沿（英文）》 2008年 第2卷 第4期   页码 475-479 doi: 10.1007/s11783-008-0071-3

摘要： The potential accumulation of platinum group elements (PGE) in the environment from automobile catalysts is high in urban areas, with the major sinks being roadside soils. Therefore, this investigation presented the detailed study on characterized concentrations of Pt and Pd and their enrichment ratios in urban roadside soils in Xuzhou, China in March 2003. Data from 21 roadside topsoil samples analyzed by inductively coupled plasma-mass spectrometer (ICP-MS) illustrated that the medians of concentrations of Pt and Pd were 2.9 and 2.8 ng/g, respectively. Hierarchical clustering analysis indicated that Pt and Pd were mainly from traffic emissions. Compared to unpolluted soils, computation of Pt and Pd enrichment ratios suggested that the Xuzhou roadside soils had average enrichment factors of 3.53 for Pt (in range of 1.22–5.73) and of 3.37 for Pd (in range of 1.35–4.46). Lower Pt/Pd ratios (in range of 0.35–2.86) in relation to similar studies in other countries were observed, which might be due to the different Pt/Pd ratios in Chinese automobile catalytic converters. Moreover, fine fraction (<250 ?m) contained higher concentrations of Pt and Pd compared to the coarse fraction (250–500 ?m).

关键词： platinum     detailed     different     Hierarchical     automobile catalytic    

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Simulation of horizontal slug-flow pneumatic conveying with kinetic theory

GU Zhengmeng, GUO Liejin

《能源前沿（英文）》 2007年 第1卷 第3期   页码 336-340 doi: 10.1007/s11708-007-0050-6

摘要： Wavelike slug-flow is a representative flow type in horizontal pneumatic conveying. Kinetic theory was introduced to establish a 3D kinetic numerical model for wavelike slug gas-solid flow in this paper. Wavelike motion of particulate slugs in horizontal pipes was numerically investigated. The formation and motion process of slugs and settled layer were simulated. The characteristics of the flow, such as pressure drop, air velocity distribution, slug length and settled layer thickness, and the detailed changing characteristics of slug length and settled layer thickness with air velocity were obtained. The results indicate that kinetic theory can represent the physical characteristics of the non-suspension dense phase flow of wavelike slug pneumatic conveying. The experiment in this paper introduced a new idea for the numerical calculation of slug-flow pneumatic conveying.

关键词： velocity distribution     detailed     slug-flow     gas-solid     theory    

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Development of a steady thermal-hydraulic analysis code for the China Advanced Research Reactor

TIAN Wenxi, QIU Suizheng, GUO Yun, SU Guanghui, JIA Dounan, LIU Tiancai, ZHANG Jianwei

《能源前沿（英文）》 2007年 第1卷 第2期   页码 189-194 doi: 10.1007/s00000-007-0024-8

摘要： A multi-channel model steady-state thermal-hydraulic analysis code was developed for the China Advanced Research Reactor (CARR). By simulating the whole reactor core, the detailed mass flow distribution in the core was obtained. The result shows that structure size plays the most important role in mass flow distribution, and the influence of core power could be neglected under single-phase flow. The temperature field of the fuel element under unsymmetrical cooling condition was also obtained, which is necessary for further study such as stress analysis, etc. of the fuel element. At the same time, considering the hot channel effect including engineering factor and nuclear factor, calculation of the mean and hot channel was carried out and it is proved that all thermal-hydraulic parameters satisfy the Safety design regulation of CARR .

关键词： detailed     calculation     unsymmetrical     temperature     channel    

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Detailed analysis of PCBs and PCDD/Fs impurities in a dielectric oil sample (ASKAREL Nr 1740) from an

Jun HUANG, Yamei HUI, Toru MATSUMURA, Gang YU, Shubo DENG, Makoto YAMAUCHI, Changmin WU, Norimasa YAMAZAKI

《环境科学与工程前沿（英文）》 2014年 第8卷 第2期   页码 195-204 doi: 10.1007/s11783-013-0527-y

摘要： Homolog and congener profiles of polychlorinated biphenyls (PCBs), polychlorinated dibenzo- - dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in commercial PCBs formulations are useful information for the source appointment of PCBs contamination as well as the risk assessment caused by potential exposure. Dielectric oil (ASKAREL Nr 1740) in an imported transformer found in China was sampled and analyzed by isotope dilution technology using high resolution gas chromatography-high resolution mass spectrometry (HRGC/HRMS). The detailed homolog and congener profiles of PCBs obtained were compared with those of known Aroclor formulations. High similarity in the homolog profile between the oil sample and Aroclor 1260 was found, with the hexachlorinated and heptachlorinated biphenyls accounting for more than 80.2% of the total PCBs concentration. Severn indicator PCBs contribute about 30%, while 12 PCB congeners (i.e., #153, #143, #168, #180, #149, #165, #138, #170, #190, #187, #174, #181) account for more than 50% of the total PCB concentrations. Total concentration of PCDDs, PCDFs and dioxin-like PCBs (DL-PCBs) was found to be 740 ng TEQ/g, of which 620 ng TEQ/g came from DL-PCBs. The contribution of PCDDs to the total TEQ was neglectable. The concentration of PCDFs homologs follows the order of OCDF>HxCDFs>HpCDFs>PeCDFs>TeCDFs, which is in consistence with the previous study on Aroclor 1260. Three DL-PCBs congeners (i.e., #118, #156, #157) accounted for 77% of the total concentration of DL-PCBs, also they contribute 72% in the TEQ caused by DL-PCBs.

关键词： profiles of polychlorinated biphenyls (PCBs)     polychlorinated dibenzo-p-dioxins (PCDDs)     polychlorinated dibenzofurans (PCDFs)     Askarel transformer     insulating fluid    

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蒸汽裂解建模中的人工智能——详细流出物预测深度学习算法 Article

Pieter P. Plehiers, Steffen H. Symoens, Ismaël Amghizar, Guy B. Marin, Christian V. Stevens, Kevin M. Van Geem

《工程（英文）》 2019年 第5卷 第6期   页码 1027-1040 doi: 10.1016/j.eng.2019.02.013

摘要：

化工过程可以从快速准确的流出物成分预测中获益良多，以进行工厂设计、控制和优化。工业4.0革命宣称，通过将机器学习引入这些领域，就可实现可观的经济收益和环境收益。高频优化和工艺控制的瓶颈往往是按要求对原料和产品等进行详细分析所需的时间。为解决这些问题，已为最大的化工品生产工艺——蒸汽裂解——建立由四个深度学习人工神经网络（DL ANNs）组成的框架。所提出的方法可根据有限数量的石脑油商业指标和可快速获得的工艺特性，确定石脑油原料的详细特性和蒸汽裂解炉流出物的详细组成。根据沸点曲线上的三个点和PIONA（烷烃、异链烷烃、烯烃、环烷烃和芳香烃）特性预测石脑油的详细特性。若沸点不可用，则同时对沸点进行估计。即使在估计沸点的情况下，所建立的深度学习人工神经网络仍优于已有的香农信息熵最大化和传统人工神经网络等方法。对于原料重构，在测试集得到的平均绝对误差（MAE）为0.3 wt%，流出物预测的平均绝对误差为0.1 wt%。结合所有网络时——使用前一网络的输出作为下一网络的输入——流出物平均绝对误差增大至0.19 wt%。除这些网络具有高精度外，主要好处是获得预测值所需的计算成本可忽略不计。在标准的英特尔i7处理器上，预测值以毫秒为单位。COILSIM1D等商业软件在精度方面表现稍好一些，但每个反应所需的中央处理器时间以秒为单位。速度大大提高，精度损失极小，使所提出的框架非常适用于连续监控难以获取的工艺参数，且非常适用于预想的高频实时优化（RTO）策略或工艺控制。然而，缺乏基本依据意味着几乎完全丧失基本的理解，而这并不总是被工程界广泛接受。此外，对于那些与训练集内石脑油非常不同的石脑油，所建立网络的性能有明显下降。

关键词： 人工智能     深度学习     蒸汽裂解     人工神经网络    

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标题 作者 时间 类型 操作

Methodological considerations for redesigning sustainable cropping systems: the value of data-mining large and detailed

Nicolas MUNIER-JOLAIN, Martin LECHENET

期刊论文

Concentrations of anthropogenic Pt and Pd in urban roadside soils in Xuzhou, China

WANG Xuesong, SUN Cheng

期刊论文

Simulation of horizontal slug-flow pneumatic conveying with kinetic theory

GU Zhengmeng, GUO Liejin

期刊论文

Development of a steady thermal-hydraulic analysis code for the China Advanced Research Reactor

TIAN Wenxi, QIU Suizheng, GUO Yun, SU Guanghui, JIA Dounan, LIU Tiancai, ZHANG Jianwei

期刊论文

Detailed analysis of PCBs and PCDD/Fs impurities in a dielectric oil sample (ASKAREL Nr 1740) from an

Jun HUANG, Yamei HUI, Toru MATSUMURA, Gang YU, Shubo DENG, Makoto YAMAUCHI, Changmin WU, Norimasa YAMAZAKI

期刊论文

蒸汽裂解建模中的人工智能——详细流出物预测深度学习算法

Pieter P. Plehiers, Steffen H. Symoens, Ismaël Amghizar, Guy B. Marin, Christian V. Stevens, Kevin M. Van Geem

期刊论文