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世界钢铁 2013年第5期13卷 18-23页

作者： Guillermo Pea Chipatecua Saulo H Freitas Seabra da Rocha peter quicker 周海忠亚琛工业大学

铸造焦是冲天炉的主要燃料和碳化剂。鉴于焦炭价格较高和二氧化碳减排的压力,德国铸造业必须寻找一种焦煤的替代资源。开始于2010年1月的一个研究项目确定了以生物质残留物为基础开发合适的铸造焦替代物的框架。开发出来的生物质焦炭应... 详细信息

铸造焦是冲天炉的主要燃料和碳化剂。鉴于焦炭价格较高和二氧化碳减排的压力,德国铸造业必须寻找一种焦煤的替代资源。开始于2010年1月的一个研究项目确定了以生物质残留物为基础开发合适的铸造焦替代物的框架。开发出来的生物质焦炭应该像煤粉末压块一样,在冲天炉熔炼过程中没有质量损失和引起冶炼问题。在碳化炉中,一共对15个不同的生物质(如秸秆、木质残留物、坚果壳等)进行了碳化试验,并对它们的燃料特性(如灰分、成分、热值、微量元素含量)进行了分析。考虑收购成本、收购的难易程度并结合分析结果,选择了可以试验的原料,在连续回转窑反应器中进行高温分解试验。目前正在进行适应性和捣固试验并对不同结合剂进行测试,以便满足在冲天炉中的使用要求。为了证明生物质焦炭的实际性能,最终在工业化工厂进行了试验,将铸造焦的替代率提高到了50%,加入量约为20 t。基于与工厂合作项目的研究结果,将编制有关原材料选择、铸造焦替代物的碳化和成型(成块)的操作规程。

关键词：生物质高温分解回转窑反应器生物质焦炭铸造焦冲天炉

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Effects of porosity heterogeneity on chemical dissolution-front instability in fluid-saturated rocks

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Journal of Central South University 2017年第3期24卷 720-725页

作者： ZHAO Chong-bin peter SCHAUBS Bruce HOBBS Computational Geosciences Research Centre Central South University Changsha 410083 China CSIRO Mineral Resource National Research Flagship R O. Box 1130 Bentley WA 6102 Australia School of Earth and Environment The University of Western Australia Crawley WA 6009 Australia

Homogeneity and heterogeneity are two totally different concepts in *** the particle length scale,rocks exhibit strong heterogeneity in their constituents and *** the heterogeneity of porosity obeys the random uniform distribution,both the mean value and the variance of porosities in the heterogeneous porosity field can be used to reflect the overall heterogeneous characteristics of the porosity *** main purpose of this work is to investigate the effects of porosity heterogeneity on chemical dissolution front instability in fluid-saturated rocks by the computational simulation *** related computational simulation results have demonstrated that:1) since the propagation speed of a chemical dissolution front is inversely proportional to the difference between the final porosity and the mean value of porosities in the initial porosity field,an increase in the extent of the porosity heterogeneity can cause an increase in the mean value of porosities in the initial porosity field and an increase in the propagation speed of the chemical dissolution front.2) An increase in the variance of porosities in the initial porosity field can cause an increase in the instability probability of the chemical dissolution front in the fluid-saturated rock.3) The greater the mean value of porosities in the initial porosity field,the quicker the irregular morphology of the chemical dissolution front changes in the supercritical chemical dissolution *** means that the irregular morphology of a chemical dissolution front grows quicker in a porosity field of heterogeneity than it does in that of homogeneity when the chemical dissolution system is at a supercritical stage.

关键词： porosity heterogeneity chemical dissolution front instability computational simulation porous rocks

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Traffic signal detection and classification in street views using an attention model

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Computational Visual Media 2018年第3期4卷 253-266页

作者： Yifan Lu Jiaming Lu Songhai Zhang peter Hall TNList Tsinghua University Department of Computer Science University of Bath

Detecting small objects is a challenging *** focus on a special case:the detection and classification of traffic signals in street *** present a novel framework that utilizes a visual attention model to make detection more efficient,without loss of accuracy,and which *** attention model is designed to generate a small set of candidate regions at a suitable scale so that small targets can be better located and *** order to evaluate our method in the context of traffic signal detection,we have built a traffic light benchmark with over 15,000 traffic light instances,based on Tencent street view *** have tested our method both on the dataset we have built and the Tsinghua–Tencent 100K(TT100K)traffic sign *** show that our method has superior detection performance and is quicker than the general faster RCNN object detection framework on both *** is competitive with state-of-theart specialist traffic sign detectors on TT100K,but is an order of magnitude *** show generality,we tested it on the LISA dataset without tuning,and obtained an average precision in excess of 90%.

关键词： traffic light detection traffic light benchmark small object detection CNN

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Effects of Climate and the Urban Heat Island Effect on Urban Tree Growth in Houston

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Open Journal of Forestry 2017年第4期7卷 428-445页

作者： Astrid Moser Enno Uhl Thomas Rotzer peter Biber Jens Dahlhausen Barry Lefer Hans Pretzsch Chair of Forest Growth and Yield Science Center of Life and Food Sciences WeihenstephanTechnical University MunichFreisingGermany NASA Headquarters Earth Science DivisionWashington DCUSA

The growing conditions of urban trees differ substantially from forest sites and are mainly characterized by small planting pits with less water, nutrient and aeration availability, high temperatures and radiation inputs as well as pollution and soil compaction. Especially, global warming can amplify the negative effects of urban microclimates on tree growth, health and well-being of citizens. To quantify the growth of urban trees influenced by the urban climate, ten urban tree species in four climate zones were assessed in an overarching worldwide dendrochronological study. The focus of this analysis was the species water oak (Quercus nigra L.) in Houston, Texas, USA. Similar to the overall growth trend, we found in urban trees, water oaks displayed an accelerated growth during the last decades. Moreover, water oaks in the city center grew better than the water oaks growing in the rural surroundings of Houston, though this trend was reversed with high age. Growth habitat (urban, suburban, rural and forest) significantly affected tree growth (p quicker ageing and tree death resulting in higher costs for new plantings and tree management as well as the decrease in ecosystem services due to a lack of old trees providing greatest benefits for mitigating the negative effects of the urban climate.

关键词： Climate Change Growth Trends Heat Island Effect Quercus nigra Tree Ring Analyses

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A new device for the identification of lymph nodes removed during different types of neck dissection

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Health 2010年第9期2卷 1093-1096页

作者： Imre Gerlinger Tamas Ferenc Molnar Tamas Jarai peter Moricz Gabor Rath Gyula Gobel Department of Otorhinolaryngology&Head and Neck Surgery Medical SchoolUniversity of PecsPecsHungary Department of Otorhinolaryngology&Surgery Medical SchoolUniversity of PecsPecsHungary

Meticulous mapping of the lymph node status is a general principle in present-day head and neck surgery. The removal of a certain number of lymphatic levels during neck dissection may well be therapeutic in intent, but it is also mandatory for correct tumour staging. We pre- sent a precise lymph node mapping during dif- ferent types of neck dissection in the course of major head and neck surgery by a sterile plastic tray moulded in the shape of the neck. This de- vice makes lymph node mapping simpler, safer, quicker and methodically more structured than any of the present methods. It facilitates the work of the pathologist and the flow of reliable information along the surgeon-pathologist- oncologist chain. With this device, a more stru- ctured, methodical means of lymph node removal has become possible.

关键词： Head and Neck Surgery Lymph Node Mapping Neck Dissection

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