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Hydrogeochemical modelling of corrosive environment contributing to premature failure of anchor bolts in underground coal mines

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Journal of Central South University 2020年第5期27卷 1599-1610页

作者： PENG Ya wendy TIMMS School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China School of Minerals and Energy Resources Engineering UNSW SydneySydney 2052Australia Faculty of Science Engineering&Built Environment Deakin UniversityGeelong 3216Australia

Anchor bolts are commonly used throughout underground mining and tunnelling operations to improve roof ***,premature failures of anchor bolts are significant safety risks in underground excavations around the world due to susceptible bolt materials,a moist and corrosive environment and tensile *** this paper,laboratory experiments and hydrogeochemical models were combined to investigate anchor bolt corrosion and failure associated with aqueous environments in underground coal *** data and collated mine water chemistry data were used to simulate bolt corrosion reactions with groundwater and rock materials with the PHREEQC code.A series of models quantified reactions involving iron and carbon under aerobic and anaerobic conditions in comparison with ion,pH and pE trends in experimental *** models showed that corrosion processes are inhibited by some natural environmental factors,because dissolved oxygen would cause more iron from the bolts to oxidize into *** interdisciplinary insights into corrosion failure of underground anchor bolts confirm that environmental factors are important contributors to stress corrosion cracking.

关键词： anchor bolts hydrogeochemical modelling rock bolts and cable bolts stress corrosion cracking water chemistry analysis

Critics, coteries, and Pre-Raphaelite celebrity

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Equine-assisted interventions for veterans with servicerelated health conditions: a systematic mapping review

作者： wendy Graham.

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Military Medical Research 2020年第2期7卷 174-189页

作者： Adam R.Kinney Aaron M.Eakman Rebecca Lassell wendy Woo Department of Occupational Therapy Colorado State UniversityFort CollinsCO 80523USA Temple Grandin Equine Center Department of Animal SciencesColorado State UniversityFort CollinsCO 80523USA

Background:Evidence-based treatments for service-related health conditions such as posttraumatic stress disorder(PTSD),depression,and traumatic brain injury(TBI)are not effective for all ***-assisted interventions are emerging as an additional treatment modality,but little is known regarding the safe and effective delivery of these *** study aimed to describe the following features of the body of literature concerning equineassisted interventions among veterans:1)veterans who have participated in equine-assisted interventions;2)specific characteristics of equine-assisted interventions in veterans;and 3)the specific characteristics of research on equineassisted interventions in ***:We conducted a systematic mapping review of peer-reviewed literature reporting on equine-assisted interventions among veterans between 1980 and *** of nine databases yielded 3336 unique records,six of which met the inclusion criteria and were *** relevant to the study aims were extracted and ***:Equine-assisted interventions among veterans disproportionately targeted psychosocial outcomes and yielded promising *** detailed methods of EAI varied in the reported studies,ranging from communicating with the horse to mounted *** was also great diversity in outcome *** state of theoretical development regarding the mechanisms by which equine-assisted interventions benefit the veteran population is currently *** provided insufficient detail with respect to the description of the intervention,reasons for attrition,and the dose-response ***:Scientific development of equine-assisted interventions targeting psychosocial outcomes among veterans is warranted to establish their *** outcomes should be expanded,including outcomes more closely aligned with the nature of polytraumatic *** research must also emphasize the theoretical develo

关键词： Veterans Service-related injuries Equine-assisted interventions Posttraumatic stress disorder Systematic mapping review

Progress Toward Implementing the Sendai Framework, the Paris Agreement, and the Sustainable Development Goals: Policy from Aotearoa New Zealand

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International Journal of Disaster Risk Science 2020年第2期11卷 190-205页

作者： wendy S.A.Saunders Scott Kelly Suzanne Paisley Larissa B.Clarke GNS Science Lower Hutt 5010New Zealand

In 2015, Aotearoa New Zealand became a signatory to the Sendai Framework for Disaster Risk Reduction 2015–2030(Sendai Framework), the Paris Climate Change Agreement(Paris Agreement), and the Sustainable Development Goals(SDGs). Since 2017 Aotearoa New Zealand has been undergoing governance reform to realign priorities and to improve the management of natural hazards and climate change. The aim of this article is to provide a review of how Aotearoa New Zealand is taking steps to improve consistency of planning across the legislative environment, thereby implementing its commitments to the Sendai Framework, the SDGs, and the Paris Agreement. It provides an overview of the national governance arrangements, with a focus on the key legislative tools;identifies how key terms are defined nationally;and provides an overview of the governance arrangements that contribute to the country’s international obligations. The discussion describes how obligations are applied, and considers two"disruptive and proactive" action examples. Four recommended actions are provided to further implement these international aspirations:(1) take into account these international agreements during the development and implementation of all legislation;(2) build awareness, capability,and capacity within central, regional, and local governments to support implementation;(3) actively evaluate the progress of implementing initiatives designed to reduce vulnerability and strengthen resilience;and(4) ensure that more weight and value are given to indigenous planning documents.

关键词： Disaster risk resilience Living standards framework Natural hazard vulnerability New Zealand Sustainable development goals National wellbeing

The notorious Mrs. Clem

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Muscle recruitment patterns and saddle pressure indexes with alterations in effective seat tube angle

作者： (1958-)Gamber wendy

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Sports Medicine and Health Science 2022年第1期4卷 29-37页

作者： Reece McDonald wendy Holliday Jeroen Swart Department of Human Biology Faculty of Health SciencesUniversity of Cape TownSouth Africa

Alteration of the effective seat tube angle(ESTA)may affect muscle activation patterns of the lower limbs in *** is conflicting evidence due to inadequate kinematic controls in previous *** primary aim of this study was to determine the muscle activity of seven lower limb muscles during alterations of the ESTA by altering the position of both the handlebars and saddle forwards or backwards by 3 cm while ensuring controlled ***,to determine the effect on the saddle pressure *** participants performed two 5 min electromyography(EMG)trials at 70%of peak power output(PPO)for three consecutive *** was a significant increase in muscle activity in the biceps femoris,gluteus maximus,and medial gastrocnemius with reductions in ESTA while a significant increase in tibialis anterior with increases in ESTA was *** pressure indices demonstrated a significant change in frontal versus back pressure as well as mean pubic pressure with changes in *** in the ESTA affects muscle activity in some,but not all of the lower limb *** research needs to be conducted to adequately understand the mechanism behind the differences in muscle activation.

关键词： EMG Muscle recruitment Seat tube angle Pressure mapping

Analysis of the influence of groundwater and the stress regime on bolt behaviour in underground coal mines

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International Journal of Coal Science & Technology 2019年第2期6卷 286-300页

作者： Jack A.Smith Hamed Lamei Ramandi Chengguo Zhang wendy Timms School of Minerals and Energy Resources Engineering UNSW Sydney Sydney NSW 2052 Australia School of Engineering Deakin University Geelong VIC 3220 Australia

The service failure of rock bolts and cable bolts are frequently reported issues in underground coal mines. Whilst numerous experimental investigations concerned with the service failure of bolts have been conducted, numerical modelling offers an alternative approach in evaluating the factors contributing to service failures of bolts in underground mines. In this study, analysis of the influence of groundwater and tensile stress on bolts in underground coal mines was studied through the numerical modelling of a grouted bolt in the immediate roadway roof. Bolt tensile stress and groundwater dripping rates in the immediate roadway roof were analysed using a package based on finite element method to assess the effect of coal roof thickness and claystone bands, as main contributors of known service failures of bolts in roadways of underground coal mines. Increasing coal roof thickness was found to increase bolt dripping rates. Probable location of stress corrosion cracking (SCC) occurrence was established through examining the shift and increase in maximum bolt tensile stress that was exhibited along the bolt length with increasing coal roof thickness. Claystone bands situated at the top and centre horizon of a grouted bolt produced lower bolt dripping rates compared with scenarios with no claystone bands. Intersecting claystone bands at the centre horizon of a bolt for a fully grouted bolt could increase the likelihood of SCC corrosion and bolt failure by contributing to microbial corrosion processes and grout fracturing by tensile stress. This study improves the understanding the bolt failure associated with the presence of groundwater and changing stress environments, which in turn is imperative in formulating strategies to mitigate support element failures and improve the ground support viability.

关键词： Numerical modelling Groundwater Underground coal mine Stress corrosion cracking Bolt corrosion Bolt stress

跨学科视域下的协作与融合——多伦多大学信息学院院长wendy Duff教授学术访谈

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图书情报知识 2020年第1期37卷 4-8页

作者：王琳(整理/翻译/审校) 马子乔赵苗苗 wendy Duff 天津师范大学管理学院加拿大多伦多大学信息学院

2019年我们推出了"全球iSchools院长专访系列"(Interview with Global iDeans)(1),希望为大家提供全球视野下的LIS发展图景和认知,并进一步推动LIS领域(Library and Information Science)及相关学科的深度研究。在专访系列的第二期,我... 详细信息

2019年我们推出了"全球iSchools院长专访系列"(Interview with Global iDeans)(1),希望为大家提供全球视野下的LIS发展图景和认知,并进一步推动LIS领域(Library and Information Science)及相关学科的深度研究。在专访系列的第二期,我们非常荣幸地邀请到加拿大多伦多大学信息学院(Faculty of Information,University of Toronto)院长wendy Duff教授做客我们的访谈。作为iSchools联盟的加拿大第一位成员,多伦多大学信息学院特别注重跨学科的协作与融合,学位项目的设置极具特色,而Duff教授本人在档案学方面的研究也表达出强烈的人文关怀。相信这篇访谈会给大家带来新的视野和感知。就在我们这期准备出刊的时候,武汉出现了疫情,wendy Duff教授专门给我们发来了邮件:"It must be very difficult in Wuhan and there are scarifices made by Wuhan people because of the novel coronavirus.I hope you find medicine and vaccine *** you and your friends and families are well."非常时期,收到这样的问候,令人感动!作为武汉的期刊,在这场疫情中肩负起自己的担当,我们义不容辞!

关键词：多伦多大学信息学院档案学跨学科视域相关学科发展图景学术访谈

Explaining patterns of species dominance in the shrub steppe systems of the Junggar Basin(China) and Great Basin(USA)

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Journal of Arid Land 2013年第4期5卷 415-427页

作者： wendy TROWBRIDGE Thomas ALBRIGHT Scot FERGUSON Jun LI Barry PERRYMAN Robert S NOWAK Department of Natural Resources & Environmental Science University of Nevada RenoReno NV 89557USA Department of Geography University of Nevada RenoReno NV 89557USA Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Department of Agriculture Nutrition and Veterinary Sciences1664 N Virginia StreetMail Stop 202University of Nevada RenoReno NV 89557USA

Natural scientists have long recognized that regions with similar climate tend to have similar *** observations suggest that shrub steppe communities of the western US and western China may be two such regions with similar annual precipitation,temperature,land use,and *** cold dry shrub steppes have traditionally been *** these similarities,patterns of species dominance are *** species that are rare in China become dominant when introduced to the United *** objective of this study was to investigate how climate,land use and community structure may explain these patterns of species *** structure and grazing intensity were measured at 5 sites in each *** information was combined with a broader review of the literature describing the history of grazing in both *** was analyzed based on a spatially-gridded,interpolated weather time series （monthly records） and climatological summary （1961-1990 mean conditions） data set from the Climate Research *** found that differences in summer precipitation and winter minimum temperature,land use intensity,and shrub size may all contribute to the dominance of annual species in the Great Basin,particularly Bromus *** particular,previous work indicates that summer precipitation and winter temperature drive the distribution of Bromus tectorum in the Great *** a result,sites with wet summers and cold springs,similar to the Chinese sites,would not be expected to be dominated by Bromus tectorum.A history of more intense grazing of the Chinese sites,as described in the literature,also is likely to decrease fire frequency,and decreases litter and shrub dominance,all of which have been demonstrated to be important in Bromus tectorum establishment and ultimate *** research is necessary to determine if other annuals that follow the same pattern of scarcity in the Junggar Basin and dominance in the Great Basin are res

关键词： climate community ecology convergent evolution Bromus tectorum shrub steppe Junggar Basin Great Basin