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A three-dimensional feature extraction-based method for coal cleat characterization using X-ray μCT and its application to a Bowen Basin coal specimen

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 153-166页

作者： Yulai Zhang Matthew Tsang Mark Knackstedt michael turner Shane Latham Euan Macaulay Rhys Pitchers ARC Training Centre for M3D Innovation Research School of PhysicsAustralian National UniversityCanberraACT2601Australia Department of Materials Physics Research School of PhysicsAustralian National UniversityCanberraACT2601Australia Anglo American Steelmaking Coal BrisbaneQLD4000Australia SCT Operations Pty Ltd. WollongongNSW2500Australia

Cleats are the dominant micro-fracture network controlling the macro-mechanical behavior of *** understanding of the spatial characteristics of cleat networks is therefore important to the coal mining *** fracture networks(DFNs)are increasingly used in engineering analyses to spatially model fractures at various *** reliability of coal DFNs largely depends on the confidence in the input cleat *** of these parameters can be made from image-based three-dimensional(3D)characterization of coal cleats using X-ray micro-computed tomography(m CT).One key step in this process,after cleat extraction,is the separation of individual cleats,without which the cleats are a connected network and statistics for different cleat sets cannot be *** this paper,a feature extraction-based image processing method is introduced to identify and separate distinct cleat groups from 3D X-ray m CT ***(filters)representing explicit cleat features of coal are built and cleat separation is successfully achieved by convolutional operations on 3D coal *** new method is applied to a coal specimen with 80 mm in diameter and 100 mm in length acquired from an Anglo American Steelmaking Coal mine in the Bowen Basin,Queensland,*** is demonstrated that the new method produces reliable cleat separation capable of defining individual cleats and preserving 3D topology after ***-parallel fractures are also identified and separated,which has his-torically been challenging to delineate and rarely reported.A variety of cleat/fracture statistics is measured which not only can quantitatively characterize the cleat/fracture system but also can be used for DFN ***,variability and heterogeneity with respect to the core axis are *** heterogeneity is observed and suggests that the representative elementary volume(REV)of the cleat groups for engineering purposes may be a complex problem requ

关键词： Cleat separation Cleat statistics Feature extraction Discrete fracture network(DFN)modeling

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Repositioning Urban Heritage-Setting the Scene

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Built Heritage 2018年第4期2卷 1-6页

作者： michael turner Graduate Program in Urban Design Bezalel Academy of Arts and DesignJerusalemIsrael

International conventions,charters and recommendations tend to follow trends and are generally reactive to contemporary circumstances;the debates on urban heritage are no *** texts need to be read in the perspective of socio-economic and environmental considerations of their time together with their inter-dependence on other *** dramatic changes to our urban conurbations have included environmental degradation,the complexities of migrations and socio-economic *** these major concerns in managing urban heritage highlights the necessity for cross-disciplinarity in research and the need for adopting a more integrative attitude in the planning *** the General System Theory by the biologist Ludwig von Bertalanffy brings a systematic,holistic methodology from the realms of modern science into extending the historic centre and the city with a territorial approach of the metropolis allowing for sustainable and resilient rural and urban *** article brings together seven contributions on issues affecting the Recommendation on the Historic Urban Landscape The potential of the digital revolution is in the capacity of recognizing the speed and rapidity of change,and the mega-data available as affecting our lives and environment together with the role of history,tradition and continuity in linking the past to the future.

关键词： urban heritage general system theory integrative planning Historic Urban Landscape New Urban Agenda

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Impact Assessments for Urban World Heritage:European Experiences under Scrutiny

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Built Heritage 2018年第4期2卷 58-71页

作者： Dennis Rodwell michael turner Cultural Heritage and Sustainable Urban Development MelroseScotlandUK Graduate Program in Urban Design Bezalel Academy of Arts and DesignJerusalemIsrael

In the context of the broadening understanding of urban heritage,including the 2011 UNESCO Recommendation on the Historic Urban Landscape and related United Nations agendas such as the 2030 Sustainable Development Goals and the New Urban Agenda,this article questions the relevance of limited-focused impact assessments as a tool for the holistic management of complex urban sites in the 21st *** article identifies pitfalls in the use of such assessments,illustrating this principally with two cases in which retrospective assessments were undertaken post-inscription in an attempt to address conflicting interests:the visual impact study for Dresden Elbe Valley,inscribed on the World Heritage List in 2004 and delisted in 2009;and the three impact assessments for Liverpool Maritime Mercantile World Heritage Site,also inscribed in 2004,and placed on the List of World Heritage in Danger continuously since *** article identifies critical missing elements that are inherent in discrete assessments,and provides indicators for practical tools with relevant applicability.

关键词： assessment reactive proactive World Heritage Historic Urban Landscape sustainable development

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The N-terminus of COX-1 and its effect on cyclooxygenase-1 catalytic activity

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Journal of Genetics and Genomics 2010年第2期37卷 117-123页

作者： Sean Phipps michael J. turner Daniel L. Simmons Chemistry and Biochemistry Department Brigham Young University

Cyclooxygenases are encoded by COX-1 and COX-2. They share over sixty percent sequence identity in human and are similar to each other in their crystallographic structures. One major difference in the primary structure of these two isozymes is the presence of eight amino acids in the amino-terminal region of COX-1 that are not present in COX-2. The function of this amino acid sequence is unknown. In this study, a human COX-1 mutant （Δ7aa） with this sequence removed was studied in parallel with COX-1. Signal peptide cleavage, N-linked glycosylation, protein expression, distribution and dimerization were not affected by the mutation. The mutant was enzymati-cally active and showed the same sensitivity toward aspirin. The KM for the enzyme remained the same as COX-1. However, the Vmax of the COX-1 mutant decreased by 3.3-fold. We conclude that the COX-1 specific amino-terminal sequence has a subtle but detectable effect on COX-1 catalysis.

关键词： COX-1 COX-2 dimerization glycosylation aspirin KM Vmax

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New Robotic Technologies for Inspecting Two Pole Electric Generators while the Rotor Remains in Place

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Journal of Power and Energy Engineering 2015年第4期3卷 123-127页

作者： Mark Savenkov michael turner Alstom Power Thermal Services Asia

The electric generator is a highly stressed plant component requiring periodic inspection and maintenance to reduce the risk of a costly forced outage. This paper briefly introduces two new robotic technologies for performing fast and reliable inspections of two pole electric generators with minimal mechanical disassembly requirements. The first robotic system is designed to inspect within the generator rotor and stator air gap, while the second robotic system is designed to inspect the generator retaining rings. An overview of the design and construction of each system is provided, along with an explanation of the capabilities and benefits they bring to the power station owner.

关键词： Generator Condition Based Maintenance Robotic Inspection Retaining Rings

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个人信用信息共享对经济的作用与影响

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金融电子化 2011年第11期 76-78页

作者：纪敬 michael turner 北京大学金融信息化研究中心(PAFIRC) 美国政策与经济研究会美国哥伦比亚商学院远程信息研究所美国信息服务执行委员会 5. 北美通信协会政府美国参议院

在金融领域开展金融信息共享已经有了很长的历史,最初提供信息共享服务的征信机构与当今现代的征信局一样,都是本着"消除借贷中信息不对称"的目的而存在的。但不容忽视的是,信用信息共享除了可以解决信息不对称问题外,还对信贷效

关键词：信用信息共享贷款利率道德风险逆向选择征信机构借款人信贷配给信用配给美国信用卡经济

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Early pregnancy maternal cardiovascular profiling in the prediction of hypertensive disease in pregnancy

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Open Journal of Obstetrics and Gynecology 2014年第2期4卷 61-65页

作者： Jennifer Hogan Vicky O’Dwyer Nadine Farah Mairead M. Kennelly michael J. turner Bernard Stuart UCD Centre for Human Reproduction Coombe Women and Infants University Hospital Dublin Ireland

Prediction of hypertensive disease in pregnancy remains challenging. Risk factor based screening utilizing history, physical characteristics, uterine artery Doppler and serum markers have been used with varying success. As hypertension in pregnancy appears to be associated with changes in the maternal vasculature, we have investigated the utility of maternal arterial elasticity measurement, prior to 20 weeks gestation, in the prediction of hypertensive disease in pregnancy. A HDI/Pulsewave CR2000 Research Cardiovascular Profiling System was used to obtain radial artery pulse pressure waveforms from 623 Caucasian women at the time of their first antenatal visit. Outcome data were available in 610 cases and these comprised the study group. The results showed that women who subsequently developed gestational hypertension (n = 20) had higher baseline systolic, diastolic and pulse pressure values (though within the normal range) but similar arterial elasticity to those patients who did not develop hypertension. Women who later developed pre-eclampsia (n = 23) had, in addition, reduced large artery elasticity and increased systemic vascular resistance compared with women who did not develop hypertension. The measurement of maternal radial artery elasticity in early pregnancy may provide an additional refinement in screening for hypertensive disease, particularly pre-eclampsia, in pregnancy.

关键词： Pre-Eclampsia Gestational Hypertension Arterial Wall Elasticity Pulse Pressure Wave Analysis

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隐私权与政策过失——数据限制立法如何影响新兴市场中的信息引导的发展

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公法研究 2007年第1期6卷 459-479页

作者： michael A.turner Peter Johnson Dan Balis 苏苗罕哥伦比亚大学美国政治与经济研究理事会美国政治与经济研究理事会政策研究中国社会科学院法学研究所

按语:在过去的20年里,中国已经成了一个全球性的制造业基地,在众多初级和中间产品中迅速地确立了主流地位,但是服务业和零售业仍然相对欠发达和缺乏竞争力,究其原因,很重要的是一点就是目前中国尚缺乏调整企业对消费者数据(非公开可确... 详细信息

按语:在过去的20年里,中国已经成了一个全球性的制造业基地,在众多初级和中间产品中迅速地确立了主流地位,但是服务业和零售业仍然相对欠发达和缺乏竞争力,究其原因,很重要的是一点就是目前中国尚缺乏调整企业对消费者数据(非公开可确认个人的信息、交易数据和公共记录信息)的收集、保存和再利用的法律框架。

关键词：信息引导企业对消费者隐私保护中间产品流程外包呼叫中心印度经济个人信息保护欧盟法边际

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大气酸化和实验酸化的北方湖泊中石生藻类群落的复原能力

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AMBIO－人类环境杂志 2003年第3期32卷 196-202页

作者： Rolf D. Vinebrooke Mark D.Graham David L. Findlay michael A.turner 于鑫里贾纳大学

藻类群落对恢复中酸化湖泊的环境变化具有高度响应性。本文比较了北方湖泊的石生藻类群落从大气酸化(安大略省基拉尼公园)和实验酸化(南302湖,安大略省实验湖泊区)的化学恢复,以评价严重酸化的时空尺度对分类学复原能力(即恢复速率)的... 详细信息

藻类群落对恢复中酸化湖泊的环境变化具有高度响应性。本文比较了北方湖泊的石生藻类群落从大气酸化(安大略省基拉尼公园)和实验酸化(南302湖,安大略省实验湖泊区)的化学恢复,以评价严重酸化的时空尺度对分类学复原能力(即恢复速率)的影响。复原能力以经过典型对应分析(CCA)湖泊在pH恢复过程中的排序空间上的位移来表示。基拉尼湖泊的复原能力相对而言几乎可以忽略,说明南303号湖8年时间酸化实验对生物恢复的影响要弱于几十年来的大气酸化作用。溶解性有机碳,溶解性无机碳以及钙的增长很好地解释了恢复过程中的酸化湖泊的石生物种丰度的时间变化。南302湖中现察到了相反的分类学复原能力和抗性的轨迹(抗性指扰动后自原来状态的偏离),显示在恢复和酸化过程中影响石生物种的生忠因子随相应的pH值不同而不同。本文的发现揭示了在对严重酸化湖泊的生态系统恢复建立模型时,一定要考虑扰动的时空尺度以及引起恢复和酸化轨迹差异的生物滞后响应。

关键词：大气酸化实验酸化湖泊石生藻类群落复原能力化学恢复评价

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对加拿大东南部湖泊从酸沉降效应中恢复的评价

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AMBIO－人类环境杂志 2003年第3期32卷 176-182页

作者： Dean S.Jeffries Thomas A.Clair Suzanne Couture Peter J.Dillon Jacques Dupont Wendel(BiIl)Keller Donald K. McNico michael A.turner Robert Vet Russell Weeber 张路加拿大环境署国立水研究所加拿大环境署特伦特大学环境与资源系魁北克环境署水环境信息中心劳伦大学生物系加拿大环境署野生动物中心渔业和海洋局

北美洲SO_2排放量的减少激起了人们对加拿大东南部的水生态系统能迅速摆脱酸化的状态的期待。但是只有那些明显减少了排放量的冶炼厂附近的湖泊达到了这种期望值。在临近大西洋的省份魁北克和安大略,受远程污染源影响的湖泊的硫酸根离子... 详细信息

北美洲SO_2排放量的减少激起了人们对加拿大东南部的水生态系统能迅速摆脱酸化的状态的期待。但是只有那些明显减少了排放量的冶炼厂附近的湖泊达到了这种期望值。在临近大西洋的省份魁北克和安大略,受远程污染源影响的湖泊的硫酸根离子(SO_4^(2-))浓度都有一定降低,但pH和碱度则仅有较少量的提高。对于这种延迟的酸度响应,有如下几种因素可以解释:碱基阳离子含量的下降,干旱加速SO_4^(2-)的迁栘,水体内部碱性物项生成机制遭到破坏;同时硝酸盐和有机阴离子含量的提高也可能是其中的原因。对加拿大东南部生物恢复的监测资料非常有限,即使有的话,在萨德伯里(Sudbury)和基拉尼(Killarney)地区以外也很难找到恢复的证据。比如,尽管除了酸化作用外其他因素也对上述现象有一定影响,新思科舍河中的大西洋鲑鱼出现率和安大略湖潜鸟的繁殖成功率实际上正在下降。化学和生物学模型预测,只有比目前法规要求严格的多的SO_2排放削减额才能促进广泛的化学恢复和其后的生物恢复,而在加拿大东南部的众多湖泊中重建工业化前的化学与生物学条件或许很难实现。

关键词：加拿大湖泊酸沉降恢复评价远程污染源

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