Pub Date : 2020-01-01DOI: 10.17159/2309-8775/2020/v62n2a3
N. Fouché
Nanine Fouché graduated in 2008 with a Bachelor’s degree in Earth Science from Stellenbosch University. Thereafter she continued her studies and completed a Post-Graduate Diploma and MSc Eng in Geotechnical Engineering. She gained valuable experience as an engineering geologist at Aurecon South Africa, undertaking geotechnical and foundation investigations for a wide range of projects. Her passion for teaching and the academics led her to a career in teaching and research in the Civil Engineering Department at Stellenbosch University. She currently teaches geotechnical engineering courses and provides support to geotechnical research students, while also completing her PhD.
Nanine fouch于2008年毕业于Stellenbosch大学，获得地球科学学士学位。此后，她继续学习，并获得了研究生文凭和岩土工程硕士学位。她在Aurecon South Africa担任工程地质学家，为各种项目进行岩土和基础调查，积累了宝贵的经验。她对教学和学术的热情使她在斯泰伦博斯大学土木工程系从事教学和研究工作。她目前教授岩土工程课程，并为岩土工程研究的学生提供支持，同时也完成了她的博士学位。
{"title":"The liquefaction potential of the upper quaternary sands of the Cape Flats, Western Cape, South Africa","authors":"N. Fouché","doi":"10.17159/2309-8775/2020/v62n2a3","DOIUrl":"https://doi.org/10.17159/2309-8775/2020/v62n2a3","url":null,"abstract":"Nanine Fouché graduated in 2008 with a Bachelor’s degree in Earth Science from Stellenbosch University. Thereafter she continued her studies and completed a Post-Graduate Diploma and MSc Eng in Geotechnical Engineering. She gained valuable experience as an engineering geologist at Aurecon South Africa, undertaking geotechnical and foundation investigations for a wide range of projects. Her passion for teaching and the academics led her to a career in teaching and research in the Civil Engineering Department at Stellenbosch University. She currently teaches geotechnical engineering courses and provides support to geotechnical research students, while also completing her PhD.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"62 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67483015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.17159/2309-8775/2020/v62n3a3
C P Demmerez de Charmoy, P. Gräbe
PROF HANNES GRÄBE (Pr Eng, FSAICE), is a civil engineer with experience in the fields of track technology, geotechnology, advanced laboratory testing, field investigations, maintenance models and numerical analysis of track structures. He is Associate Professor: Transnet Freight Rail Chair in Railway Engineering at the University of Pretoria, where he lectures underand post-graduate courses in railway engineering. He is also responsible for railway research, as well as for continuing professional development in the form of short courses presented to industry. He holds a PhD degree from the University of Southampton (UK) and is a Fellow of the South African Institution of Civil Engineering (SAICE) and is registered with the Engineering Council of South Africa (ECSA) as a professional engineer.
HANNES教授GRÄBE (FSAICE博士)是一名土木工程师，在轨道技术、土工技术、先进实验室测试、实地调查、轨道结构维修模型和数值分析等领域拥有丰富经验。他是比勒陀利亚大学(University of Pretoria)铁路工程专业Transnet货运铁路副教授，讲授铁路工程本科和研究生课程。他还负责铁路研究，以及以短期课程的形式向行业提供持续的专业发展。他拥有英国南安普顿大学博士学位，是南非土木工程学会(SAICE)会员，并在南非工程委员会(ECSA)注册为专业工程师。
{"title":"Quantifying the economic benefits of gauge changes on the South African core railway network","authors":"C P Demmerez de Charmoy, P. Gräbe","doi":"10.17159/2309-8775/2020/v62n3a3","DOIUrl":"https://doi.org/10.17159/2309-8775/2020/v62n3a3","url":null,"abstract":"PROF HANNES GRÄBE (Pr Eng, FSAICE), is a civil engineer with experience in the fields of track technology, geotechnology, advanced laboratory testing, field investigations, maintenance models and numerical analysis of track structures. He is Associate Professor: Transnet Freight Rail Chair in Railway Engineering at the University of Pretoria, where he lectures underand post-graduate courses in railway engineering. He is also responsible for railway research, as well as for continuing professional development in the form of short courses presented to industry. He holds a PhD degree from the University of Southampton (UK) and is a Fellow of the South African Institution of Civil Engineering (SAICE) and is registered with the Engineering Council of South Africa (ECSA) as a professional engineer.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"62 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.17159/2309-8775/2020/v62n1a2
M. Loke, K. Pallav, R. Haldenwang
MAPHOLE E LOKE is a Candidate Engineering Technologist and a SAICE student member. She obtained a Diploma in Civil Engineering at Lerotholi Polytechnic (Lesotho) in 2014, a BTech from the Cape Peninsula University of Technology in 2016, and is currently pursuing a Master’s degree in Civil Engineering, working on heritage buildings. She worked as a geotechnical laboratory technician, water and sanitation technician, construction supervisor and quantity surveyor for the Lesotho Lowlands Bulk Water Supply Scheme.
MAPHOLE E LOKE是一名候选工程技术专家和sice学生会员。她于2014年获得莱罗托利理工学院(莱索托)土木工程文凭，2016年获得开普半岛理工大学土木工程学士学位，目前正在攻读土木工程硕士学位，从事文物建筑工作。她曾担任莱索托低地散装供水计划的岩土实验室技术人员、水和卫生技术人员、建筑主管和工料测量师。
{"title":"Characterisation of heritage cementing materials for restoration purposes: A review","authors":"M. Loke, K. Pallav, R. Haldenwang","doi":"10.17159/2309-8775/2020/v62n1a2","DOIUrl":"https://doi.org/10.17159/2309-8775/2020/v62n1a2","url":null,"abstract":"MAPHOLE E LOKE is a Candidate Engineering Technologist and a SAICE student member. She obtained a Diploma in Civil Engineering at Lerotholi Polytechnic (Lesotho) in 2014, a BTech from the Cape Peninsula University of Technology in 2016, and is currently pursuing a Master’s degree in Civil Engineering, working on heritage buildings. She worked as a geotechnical laboratory technician, water and sanitation technician, construction supervisor and quantity surveyor for the Lesotho Lowlands Bulk Water Supply Scheme.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.17159/2309-8775/2020/v62n2a1
P. Zhai, P. Xu
INTRoduCTIoN The process of subway construction is undergoing rapid developments in China. Shield-driven tunnels are widely used in soft ground because of their flexibility, cost-effectiveness, and minimal impact on ground traffic and surface structures. Segmental precast concrete linings (see Figure 1) connected by steel bolts are commonly used in shield-driven tunnels. These are one of the single most important elements in the total cost of tunnelling, representing 15–40% of the total cost (Iftimie 1994). Segment joint opening is a common problem in shield tunnel operations, and is Mechanical behaviour of semi-rigid connections coupling two concrete segmental linings
{"title":"Mechanical behaviour of semi-rigid connections coupling two concrete segmental linings","authors":"P. Zhai, P. Xu","doi":"10.17159/2309-8775/2020/v62n2a1","DOIUrl":"https://doi.org/10.17159/2309-8775/2020/v62n2a1","url":null,"abstract":"INTRoduCTIoN The process of subway construction is undergoing rapid developments in China. Shield-driven tunnels are widely used in soft ground because of their flexibility, cost-effectiveness, and minimal impact on ground traffic and surface structures. Segmental precast concrete linings (see Figure 1) connected by steel bolts are commonly used in shield-driven tunnels. These are one of the single most important elements in the total cost of tunnelling, representing 15–40% of the total cost (Iftimie 1994). Segment joint opening is a common problem in shield tunnel operations, and is Mechanical behaviour of semi-rigid connections coupling two concrete segmental linings","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"62 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.17159/2309-8775/2020/V62N4A1
M. Filali, A. Nechnech, J. D. Rosa, H. Gadouri, B. Meziani
MIRA FILALI is presently a PhD student in the Civil Engineering Faculty and in the Environment, Water, Geomechanics and Structures Laboratory at the University of Sciences and Technology Houari Boumediene, Algiers. She is also an engineer at the National Polytechnic School of Algiers (ENPA), and a teacher and researcher in the Earth Sciences Department at the Djilali Bounaama University, Khemis Miliana. Her research interests focus mainly on landslides in clayey soil.
MIRA FILALI目前是阿尔及尔Houari Boumediene科技大学土木工程学院和环境、水、地质力学和结构实验室的博士生。她还是阿尔及尔国家理工学院(ENPA)的工程师，以及Khemis Miliana Djilali Bounaama大学地球科学系的教师和研究员。主要研究方向为粘性土滑坡。
{"title":"Geotechnical characterisation and back analysis of a landslide in marl deposit: A case study of Algiers Sahel (coast), Algeria","authors":"M. Filali, A. Nechnech, J. D. Rosa, H. Gadouri, B. Meziani","doi":"10.17159/2309-8775/2020/V62N4A1","DOIUrl":"https://doi.org/10.17159/2309-8775/2020/V62N4A1","url":null,"abstract":"MIRA FILALI is presently a PhD student in the Civil Engineering Faculty and in the Environment, Water, Geomechanics and Structures Laboratory at the University of Sciences and Technology Houari Boumediene, Algiers. She is also an engineer at the National Polytechnic School of Algiers (ENPA), and a teacher and researcher in the Earth Sciences Department at the Djilali Bounaama University, Khemis Miliana. Her research interests focus mainly on landslides in clayey soil.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"7 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.17159/2309-8775/2020/v62n1a5
C. L. Blersch, B. Shrand, L. Ronnie
{"title":"Factors that keep engineers committed to their organisations: A study of south African knowledge workers","authors":"C. L. Blersch, B. Shrand, L. Ronnie","doi":"10.17159/2309-8775/2020/v62n1a5","DOIUrl":"https://doi.org/10.17159/2309-8775/2020/v62n1a5","url":null,"abstract":"","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"62 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.17159/2309-8775/2020/v62n2a5
R. Bester, J. Blignaut, P. van Niekerk
JAMES BLIGNAUT is a natural and environmental resource economist attached to both the School of Public Leadership, Stellenbosch, and the South African Environmental Observation Network (SAEON). He focuses on the economics of the restoration of degraded landscapes under the motto: The economics of restoration and the restoration of economics. He is especially focused on the advancement of regenerative agriculture and, within that context, proper resource use and allocation inclusive of the economic benefits of restoration.
JAMES BLIGNAUT是一名自然和环境资源经济学家，就职于斯泰伦博斯大学公共领导学院和南非环境观测网络(SAEON)。他专注于退化景观恢复的经济学，其座右铭是:恢复经济学和恢复经济学。他特别关注再生农业的发展，并在此背景下，适当地利用和分配资源，包括恢复的经济效益。
{"title":"The cost-effectiveness of water augmentation and management: Assessing the Unit Reference Value","authors":"R. Bester, J. Blignaut, P. van Niekerk","doi":"10.17159/2309-8775/2020/v62n2a5","DOIUrl":"https://doi.org/10.17159/2309-8775/2020/v62n2a5","url":null,"abstract":"JAMES BLIGNAUT is a natural and environmental resource economist attached to both the School of Public Leadership, Stellenbosch, and the South African Environmental Observation Network (SAEON). He focuses on the economics of the restoration of degraded landscapes under the motto: The economics of restoration and the restoration of economics. He is especially focused on the advancement of regenerative agriculture and, within that context, proper resource use and allocation inclusive of the economic benefits of restoration.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"62 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67483080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.17159/2309-8775/2020/V62N4A2
B. Vuuren
The following two slotted drain installation scenarios were reviewed in this paper: a slotted drain operating individually without a median barrier and a slotted drain operating with an adjacent barrier installed along the longitudinal length of the drain. The interception capability of the two installation scenarios was experimentally reviewed and compared while imitating various conditions typically expected on South African pavements. The applied sheet flow, slotted inlet sizes and pavement slopes (longitudinal and cross slopes) were varied throughout the experiment. Interception efficiencies of the slotted inlets were experimentally calculated as a ratio of total intercepted sheet flow to the total sheet flow applied to the pavement layouts. The sheet flow applied during the experiment was analysed to estimate the rainfall intensities and flow depths that can typically occur on the different pavements for which the interception capability of the slotted inlets was reviewed. It was estimated that rainfall intensities of more than 1 000 mm/hr and flow depths higherthan 10 mm were imitated during the experiment. More than 98% of the maximum applied sheet flow of approximately 3.0 £/s/m was intercepted by the 30 mm slotted inlets regardless of the pavement slope values and type of slotted drain layout. The conclusion reached was that both these slotted drain installation scenarios operating in practice for the conditions tested would have the capability to sufficiently remove the surface water to promote road safety during wet pavement conditions.
{"title":"The interception capabilities of slotted drains as pavement surface drainage systems","authors":"B. Vuuren","doi":"10.17159/2309-8775/2020/V62N4A2","DOIUrl":"https://doi.org/10.17159/2309-8775/2020/V62N4A2","url":null,"abstract":"The following two slotted drain installation scenarios were reviewed in this paper: a slotted drain operating individually without a median barrier and a slotted drain operating with an adjacent barrier installed along the longitudinal length of the drain. The interception capability of the two installation scenarios was experimentally reviewed and compared while imitating various conditions typically expected on South African pavements. The applied sheet flow, slotted inlet sizes and pavement slopes (longitudinal and cross slopes) were varied throughout the experiment. Interception efficiencies of the slotted inlets were experimentally calculated as a ratio of total intercepted sheet flow to the total sheet flow applied to the pavement layouts. The sheet flow applied during the experiment was analysed to estimate the rainfall intensities and flow depths that can typically occur on the different pavements for which the interception capability of the slotted inlets was reviewed. It was estimated that rainfall intensities of more than 1 000 mm/hr and flow depths higherthan 10 mm were imitated during the experiment. More than 98% of the maximum applied sheet flow of approximately 3.0 £/s/m was intercepted by the 30 mm slotted inlets regardless of the pavement slope values and type of slotted drain layout. The conclusion reached was that both these slotted drain installation scenarios operating in practice for the conditions tested would have the capability to sufficiently remove the surface water to promote road safety during wet pavement conditions.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"62 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.17159/2309-8775/2020/v62n3a1
M. Brinkley, A. Ilemobade, M. Ncube
MEGHAN BRINKLEY (MSc, PrEng, PMP, MSAICE) currently works for SMEC South Africa (Pty) Ltd and has over 14 years of experience in the Engineering and Project Management fields. She is currently involved with a number of water demand management and water metering projects. In these projects, her focus is on data capturing and project management to ensure accurate records and trend analysis for clients. This article emanated from her MSc research project at the School of Civil and Environmental Engineering, University of the Witwatersrand, Johannesburg.
MEGHAN BRINKLEY (MSc, PrEng, PMP, MSAICE)目前在SMEC South Africa (Pty) Ltd工作，在工程和项目管理领域拥有超过14年的经验。她目前参与了一些水需求管理和水计量项目。在这些项目中，她专注于数据采集和项目管理，以确保为客户提供准确的记录和趋势分析。本文源于她在约翰内斯堡威特沃特斯兰德大学土木与环境工程学院的硕士研究项目。
{"title":"Water meter replacement and its impact on water consumption, utility revenue and payback periods","authors":"M. Brinkley, A. Ilemobade, M. Ncube","doi":"10.17159/2309-8775/2020/v62n3a1","DOIUrl":"https://doi.org/10.17159/2309-8775/2020/v62n3a1","url":null,"abstract":"MEGHAN BRINKLEY (MSc, PrEng, PMP, MSAICE) currently works for SMEC South Africa (Pty) Ltd and has over 14 years of experience in the Engineering and Project Management fields. She is currently involved with a number of water demand management and water metering projects. In these projects, her focus is on data capturing and project management to ensure accurate records and trend analysis for clients. This article emanated from her MSc research project at the School of Civil and Environmental Engineering, University of the Witwatersrand, Johannesburg.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"11 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.17159/2309-8775/2021/v63n3a2
Kobus Delport
Armorflex is an articulating concrete block erosion protection measure that has been used as an alternative to riprap for many years. Even though extensive research and hydraulic testing have been conducted on Armorflex, the principal constraint on the use of concrete blocks has been the lack of information on prototype performance. Furthermore, there are no standards for Armorflex or articulating concrete block revetments in the South African National Standards, and design guidelines from Armorflex manufacturers are insufficient. The aim of this study was to improve the understanding of the critical flow conditions under which Armorflex blocks are lifted and removed by flowing water in open channel flow applications. Scaled laboratory tests were conducted on Armorflex 140 and Armorflex 180 blocks. Liu's theory of 1957 is applied in an attempt to define the point where block movement is initiated.
{"title":"Incipient motion of Armorflex articulating concrete blocks on steep slopes","authors":"Kobus Delport","doi":"10.17159/2309-8775/2021/v63n3a2","DOIUrl":"https://doi.org/10.17159/2309-8775/2021/v63n3a2","url":null,"abstract":"Armorflex is an articulating concrete block erosion protection measure that has been used as an alternative to riprap for many years. Even though extensive research and hydraulic testing have been conducted on Armorflex, the principal constraint on the use of concrete blocks has been the lack of information on prototype performance. Furthermore, there are no standards for Armorflex or articulating concrete block revetments in the South African National Standards, and design guidelines from Armorflex manufacturers are insufficient. The aim of this study was to improve the understanding of the critical flow conditions under which Armorflex blocks are lifted and removed by flowing water in open channel flow applications. Scaled laboratory tests were conducted on Armorflex 140 and Armorflex 180 blocks. Liu's theory of 1957 is applied in an attempt to define the point where block movement is initiated.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47034556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：