期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Geochemical and petrological studies of high sulfur coal and overburden from Makum coalfield (Northeast India) towards understanding and mitigation of acid mine drainage
1
作者 Angana Mahanta Debashis Sarmah +6 位作者 Nilotpol Bhuyan Monikankana Saikia Sarat Phukan K.S.V.Subramanyam ajit singh Prasenjit Saikia Binoy K.Saikia 《International Journal of Coal Science & Technology》 EI CAS CSCD 2024年第1期133-147,共15页
Opencast coal mining produces trash of soil and rock containing various minerals,that are usually dumped nearby the abandoned sites which causes severe environmental concern including the production of acid mine drain... Opencast coal mining produces trash of soil and rock containing various minerals,that are usually dumped nearby the abandoned sites which causes severe environmental concern including the production of acid mine drainage(AMD)through oxidation pyrite minerals.The current study entailed assessing the potential production of AMD from an opencast coal mining region in Northeast part of India.In order to have a comprehensive overview of the AMD problem in Makum coalfield,the physico-chemical,geochemical,and petrological characteristics of the coal and overburden(OB)samples collected from the Makum coalfield(Northeast India)were thoroughly investigated.The maceral compositions reveal that coal features all three groups of macerals(liptinite,vitrinite,and inertinite),with a high concentration of liptinite indicating the coal of perhydrous,thereby rendering it more reactive.Pyrite(FeS_(2))oxidation kinetics were studied by conducting the aqueous leaching experiments of coal and(OB)samples to interpret the chemical weathering under controlled laboratory conditions of various temperature and time periods,and to replicate the actual mine site leaching.Inductively coupled plasma-optical emission spectroscopy(ICP-OES)was operated to detect the disposal of some precarious elements from coal and OB samples to the leachates during our controlled leaching experiment.The Rare earth element(REE)enrichment in the samples shows the anthropogenic incorporation of the REE in the coal and OB.These experiments reveal the change in conductivity,acid producing tendency,total dissolved solid(TDS),total Iron(Fe)and dissolved Sulfate(SO_(4)^(2−))ions on progress of the leaching experiments.Moreover,the discharge of FeS_(2) via atmospheric oxidation in laboratory condition undergoes a significant growth with the rise of temperature of the reaction systems in the environment and follows pseudo first order kinetics.A bio-remediative strategies is also reported in this paper to mitigate AMD water by employing size-segregated powdered limestone and water hyacinth plant in an indigenously developed site-specific prototype station.Apart from neutralisation of AMD water,this eco-friendly AMD remediation strategy demonstrates a reduction in PHEs concentrations in the treated AMD water. 展开更多
关键词 Opencast mining Pyrite oxidation Coal geochemistry Coal petrology Rare earth elements AMD remediation
下载PDF
Effect of climate change on seasonal monsoon in Asia and its impact on the variability of monsoon rainfall in Southeast Asia 被引量:9
2
作者 Yen Yi Loo Lawal Billa ajit singh 《Geoscience Frontiers》 SCIE CAS CSCD 2015年第6期817-823,共7页
Global warming and climate change is one of the most extensively researched and discussed topical issues affecting the environment.Although there are enough historical evidence to support the theory that climate chang... Global warming and climate change is one of the most extensively researched and discussed topical issues affecting the environment.Although there are enough historical evidence to support the theory that climate change is a natural phenomenon,many research scientists are widely in agreement that the increase in temperature in the 20 th century is anthropologically related.The associated effects are the variability of rainfall and cyclonic patterns that are being observed globally.In Southeast Asia the link between global warming and the seasonal atmospheric flow during the monsoon seasons shows varying degree of fuzziness.This study investigates the impact of climate change on the seasonality of monsoon Asia and its effect on the variability of monsoon rainfall in Southeast Asia.The comparison of decadal variation of precipitation and temperature anomalies before the 1970 s found general increases which were mostly varying.But beyond the 1970 s,global precipitation anomalous showed increases that almost corresponded with increases in global temperature anomalies for the same period.There are frequent changes and a shift westward of the Indian summer monsoon.Although precipitation is observed to be 70%below normal levels,in some areas the topography affects the intensity of rainfall.These shifting phenomenon of other monsoon season in the region are impacting on the variability of rainfall and the onset of monsoons in Southeast Asia and is predicted to delay for 15 days the onset of the monsoon in the future.The variability of monsoon rainfall in the SEA region is observed to be decadal and the frequency and intensity of intermittent flooding of some areas during the monsoon season have serious consequences on the human,financial,infrastructure and food security of the region. 展开更多
关键词 Climate change Temperature anomalies Precipitation anomalies Seasonal monsoons Rainfall variability Southeast Asia
下载PDF
Implementing Augmented Reality in Learning
3
作者 ajit singh 《Psychology Research》 2019年第4期172-177,共6页
Technologies are changing and ever growing.One of the newest developing technologies is augmented reality(AR),which can be applied to many different existing technologies,such as computers,tablets,and smartphones.AR t... Technologies are changing and ever growing.One of the newest developing technologies is augmented reality(AR),which can be applied to many different existing technologies,such as computers,tablets,and smartphones.AR technology can also be utilized through wearable components,for example,glasses.Throughout this paper review on AR,the following aspects are discussed at length:research explored,theoretical foundations,applications in education,challenges,reactions,and implications.Several different types of AR devices and applications are discussed at length,and an in-depth analysis is done on several studies that have implemented AR technology in an educational setting. 展开更多
关键词 AUGMENTED REALITY LEARNING and development EDUCATOR flow theory JUST-IN-TIME LEARNING
下载PDF
Education System & Emerging Technologies
4
作者 ajit singh 《Psychology Research》 2019年第12期497-503,共7页
The Internet has evolved from connecting people and later videos,photos,and text to more recently physical objects.Using sensors,physical objects can“talk”(transmit data)to each other and even command each other to ... The Internet has evolved from connecting people and later videos,photos,and text to more recently physical objects.Using sensors,physical objects can“talk”(transmit data)to each other and even command each other to perform a physical act.As things and people become more connected,such objects will also become part of social networks,much in the same way that people tag photos on Facebook.In this way,the value of such objects will increase for both research and learning.The IOT and Cloud computing technologies can provide solutions for the above mentioned problems in education system.Cloud computing enables users to control and access data via the Internet.The main users of a typical higher education cloud include students,Faculty,administrative staff,Examination Branch,and Admission Branch.All the main users of the institution are connected to the cloud.Separate login is provided for all the users for their respective work.Teachers can upload their class tutorials,assignments,and tests on the cloud server through which students will be able to access all the teaching material provided by the teachers via Internet using computers and other electronic devices both at home and college and 24X7.This paper focuses on the integration of Cloud and IOT for education system.Connected devices can help make life easier for students with special needs.Many of the daydreams for IOT in education involve students taking advantage of new technologies to complete cool new projects. 展开更多
关键词 the IOT and CLOUD TECHNOLOGIES EDUCATION SYSTEM IMPLEMENTATION
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部