38 research outputs found
Comments on “Estimating Income Variances by Probability Sampling: A Case Study by Shah and Aleem”
No full textIn this article, we wish to write comments on recently published article “Shah, A.A. and Aleem, M. (2010). Estimating income variances by probability sampling: a case study. Pakistan Journal of Commerce and Social Sciences, 4(2), 194-201”, which suggest improvement as well as criticism on the paper and also contribute effectively towardsjournal repute and ranking
Corrigendum to ‘Surgical Outcomes in Patients with Congenital Cervical Spinal Stenosis’ [World Neurosurgery 141 (2020) e645-e650] (World Neurosurgery (2020) 141(e645-e650) (S1878875020312250), (10.1016/j.wneu.2020.05.252))
No full text© 2020 Elsevier Inc. The authors regret that the author Bryan S. Lee, M.D. was incorrectly omitted from the final publication. The author list should read as follows: Karam Atli, Vikram Chakravarthy, Aleem I. Khan, Bryan S. Lee, Don Moore, Michael P. Steinmetz, Thomas E. Mroz. The authors would like to apologise for any inconvenience caused
Microfluidics for Fluid Analysis in Oil Sands and Tight Oils
No full textUnconventional oil recovery has advanced over the decades as conventional oil supply declines. In North America, unconventional oil has been commercialized in the oil sands and shale formations. However, as oil prices collapse and emission concerns associated with hydrocarbon recovery increases, producers are seeking cost-effective methods to improve economic and environmental performance. Steam-Assisted Gravity Drainage (SAGD) and hydraulic fracturing methods are hindered by massive water demands for stimulating formations. Microfluidics, a fluid analysis tool benefiting from small sample volumes and precise quantification, has emerged as a useful platform for hydrocarbon analysis, particularly for demanding, reservoir-relevant conditions (high temperatures and pressures). In this vein, the presented work demonstrates two microfluidic applications. The first method is a tube-based viscometer with in-line mixing relevant to solvent-based recovery of oil sands. The second method is a physical model of nanopores relevant to hydraulic fracturing with the aim to show fluid interactions at the pore-scale.M.A.S.2018-05-06 00:00:0
Microfluidics for Fluid Analysis in Oil Sands and Tight Oils
No full textUnconventional oil recovery has advanced over the decades as conventional oil supply declines. In North America, unconventional oil has been commercialized in the oil sands and shale formations. However, as oil prices collapse and emission concerns associated with hydrocarbon recovery increases, producers are seeking cost-effective methods to improve economic and environmental performance. Steam-Assisted Gravity Drainage (SAGD) and hydraulic fracturing methods are hindered by massive water demands for stimulating formations. Microfluidics, a fluid analysis tool benefiting from small sample volumes and precise quantification, has emerged as a useful platform for hydrocarbon analysis, particularly for demanding, reservoir-relevant conditions (high temperatures and pressures). In this vein, the presented work demonstrates two microfluidic applications. The first method is a tube-based viscometer with in-line mixing relevant to solvent-based recovery of oil sands. The second method is a physical model of nanopores relevant to hydraulic fracturing with the aim to show fluid interactions at the pore-scale.M.A.S.2018-05-06 00:00:0
Collaborative consumption: What would motivate customers to be part of it? The case of second-hand shopping on Vinted with the French population
No full textCollaborative consumption has recently gained prominence as a fresh approach to modern
consumerism, merging economic principles with sustainability objectives. By deep diving into this
subject, this study gives an overall explanation of business areas related which are sharing economy,
circular economy, or even circular fashion. This thesis investigates the determinants that drive
individuals to engage in collaborative consumption, specifically in second-hand shopping on the Vinted
platform in France. As circular business models progressively gain dynamism, this study delves into
consumer behaviour and evaluates the interactions of diverse motivations, including hedonic,
environmental, economic, and social factors. To provide a good understanding, the author conducted
semi-structured interviews with 10 participants, unravelling a complex range of motivations that align
with previous quantitative research, underscoring the majority and significance of these drivers.
Another motive not discussed in the literature review was highlighted thanks to the interviews: the
convincing motive. It seems that individuals who are already participating in Collaborative
Consumption are trying to convince others to change their consumption habits. This study navigates the
uncharted waters of collaborative consumption's motives, highlighting its relevance in the context of
sustainable and conscious consumer behaviour.O consumo colaborativo tem vindo a ganhar uma grande proeminência como uma nova abordagem ao
consumismo moderno, conseguindo fundir princípios económicos com objetivos de sustentabilidade. O
presente estudo consiste em explorar o tema do consumo colaborativo, bem como a economia circular
e a moda circular. Ao longo do estudo, foi efetuada uma pesquisa com intuito de investigar os
determinantes que levam os indivíduos a envolverem-se no consumo colaborativo, especificamente em
compras de segunda mão na plataforma Vinted, em França. À medida que os modelos de negócios
circulares ganham progressivamente impulso, este estudo investiga o comportamento do consumidor e
avalia a interação de diversas motivações, incluindo fatores hedónicos, ambientais, económicos e
sociais. Foram efetuadas entrevistas semi-estruturadas com 10 participantes, revelando uma gama
complexa de motivações que se alinham com a investigação. Por fim, são apresentadas conclusões e
futuras linhas de investigação
Investigation of crystallographic disorientation topology in simulation of rolling textures with the ALAMEL model
No full textThe crystallographic texture of a material has a direct impact on its mechanical and functional properties. As a result, texture control is an imperative part of manufacturing processes, especially those involving plastic deformation, such as rolling, which significantly impact crystallographic texture. The exact mechanisms and underlying causes behind such texture evolutions are not well understood. This study investigates the effect of initial disorientation topology on plastically deformed texture, with the help of mean field crystal plasticity simulations performed using the ALAMEL model. The simulated textures are compared to experimentally measured textures of IF steel samples with symmetric rolling reductions of 55 % and 83 %. The results indicate a clear distinction between low disorientation topologies and high disorientation topologies, most evident at high rolling reductions. The study aims to incorporate the disorientation information into the ALAMEL simulations, by re-ordering textural input orientations. The Monte Carlo algorithm is used in addition to the Hungarian Algorithm to re-order orientations based on pre-set disorientation angles. A comparison between the two re-ordering algorithms is also performed, and the Hungarian algorithm is found to have a disorientation distribution closer the ideal result. A comparison between the two yields minimal differences, with the difference between the two results being the error index local minima for minimum disorientation evolved textures and average disorientation (between 35°. Local maxima for error index comparisons are observed for very high disorientation values of over 60°. In the present study, we also result spread for similar disorientation topologies orders to discount the randomness associated with such a process. Thus, multiple files are created with largely similar disorientation characteristics but different grain orders. An overlap is observed for high disorientation simulations, at a higher frequency for lower rolling reductions. The deviation of obtained results is also highest for a disorientation angle average of 15°. The simulated texture comparisons between textures with modified and unmodified texture disorientation topology also indicate a higher disparity with minimum disorientation modified texture. A convergence is observed at a disorientation value between 35° and 40°, close to the disorientation average of the unmodified texture, and an overlap is observed at higher disorientation values. The valorisation of such a technology is also considered in this study. The current study precedes applied research and is assessed as a level 2 on the technology readiness scale, in danger of facing the ‘valley of death’. This is owing to fading interest and funding unless the private sector see’s value in the technology. The domain most aligned for the application of such technology is electrical steels, which is set to see a large increase in demand and will play a significant role in the energy transition and move towards electrical mobility. The high cost of development and price sensitive market serve as barriers of entry, and entry into the niche beachhead market of DC converters for next generation ‘more electrified aircraft’ is determined to be an appropriate valorisation strategy. The study also proposes a ‘way to market’ strategy, drawing parallels with other high tech and high value material industries, to determine ‘critical partnerships’ with high levels of integration in addition to leadership in materials and manufacturing development as key factors for a successful market entry
Imperfect Information, Screening, and the Costs of Informal Lending: A Study of a Rural Credit Market in
No full textCompressive Strength of Composite Resins at Different Exposure Time Using LED and Halogen Units
No full textExperimental Study on the Effect of Parameters on Sedimentation and Coalescing Profiles in Liquid-liquid Batch Settler
No full textAbstractEfficient separation of liquid-liquid mixture based on dispersion is often required in many industrial processes. Influence of mixing time, initial height of dispersion, mixing intensity and oil phase ratio on the separation time in liquid-liquid batch settler/separator were investigated in terms of coalescence and sedimentation profile. Experiments were carried out with oil in water type dispersion. Results showed that in most of cases coalescence controls the time of separation. The experiment results of liquid-liquid separation profiles were compared with the predefined model. MATLAB was used for the fitting of coalescence profile and calculating fitting constants. The data obtained from the batch experiments along with the mathematical model can be used as a good monitoring tool for studying the liquid-liquid dispersion behaviour in industrial units
In vivo Extraction and Quantification of Antivenomous Antibodies in Chickens Against Scorpion Venom
No full textAuthor check list ARRIVE for animals usage ethics for the research article
