706 research outputs found
Particle motion in Stokes flow near a plane fluid-fluid interface. Part 1. Slender body in a quiescent fluid.
No full textConsiders translation and rotation, each in three mutually orthogonal directions, thus determining the components of the hydrodynamic resistance tensors which relate the total hydrodynamic force and torque on the particle to its translational and angular velocities for a completely arbitrary translational and angular motion. Calculates trajectories for a freely rotating particle under the action of an applied force either normal or parallel to a flat interface.-from Author
Particle motion in Stokes flow near a plane fluid-fluid interface. Part 2. Linear shear and axisymmetric straining flows.
No full textConsiders the motion of a sphere or a slender body in the presence of a plane fluid-fluid interface with an arbitrary viscosity ratio, when the fluids undergo a linear undisturbed flow. Determines the motion of a neutrally buoyant particle freely suspended in the flow. The theory yields general trajectory equations for an arbitrary viscosity ratio. Among the most interesting results for motion of slender bodies is the generalization of the Jeffrey orbit equations for linear simple shear flow. -from Author
Pulsed initiation polymerization : applications in homogeneous and heterogeneous radical systems
No full text
To What Extent Can Tablet Computers (iPads) be Used to Support the Acquisition of Investigative Skills in Primary Science?
No full textChildren in the UK over the last fifteen years have grown up surrounded by mobile technology. Information is accessed through a plethora of hardware including laptop computers and more prevalently through “hand held” mobile devices, including mobile phones, mp3 players and tablet computers. The vast majority of children in this generation (born 1995 – 2010, termed digital natives) have a growing familiarity with such technology and by school entry age, are familiar with the use of mobile technologies.
The challenge for educationalists is to harness this proficiency with technology in the classroom. Whilst hand held technologies are starting to be used in several subjects across the primary curriculum [1], it has been suggested that the development of effective pedagogical approaches to TEL has significantly lagged behind technological advances [2].
Science, most particularly investigative experimentation, is an ideal opportunity for children to use hand held devices, due to the accessibility and mobility of this technology. This study aims to investigate the scope of embedding tablet computer use during experimentation; specifically to explore the extent by which iPads can have an impact upon the acquisition of skills e.g. planning for upper Key stage 2 (10 - 11 year old) children.
The research was approached from an interpretivist paradigm with mainly qualitative data collection methods being used. Before undertaking the research, extensive negotiations and planning sessions were undertaken with the class teachers to ensure the experimental investigations were designed at an appropriate level of challenge and integrated within the existing cross-curricular scheme of work.
The children carried out eight investigations over a period of 7 days (in one 2 day block and another 5 day block) and had access to their own individual iPad throughout the experimentation process. The researchers undertook semi-structured observations to determine how the children used the iPads throughout the experiments, with four main considerations in mind in terms of autonomy, which were taken from recent research in the area [3].
In order to achieve triangulation of data, semi-structured small group interviews were carried out following experimentation to allow the children to provide detailed information of their views of how iPads impacted upon their learning. Staff also completed structured reflective responses to taught sessions.
The data shows that there was a significant impact of using Ipads during scientific investigations, the most prominent features being improved planning and experimental outcome recording. Peer assessment and sharing ideas, especially in terms of discussion surrounding experimental results were prevalent. It is hoped to develop this work to inform future pedagogic approaches to promoting investigational science skills in young learners
Correction to: Clinical Trials in High-Risk Medulloblastoma: Evolution of the SIOP-Europe HR-MB Trial (Cancers, (2022), 14, 2, (374), 10.3390/cancers14020374)
No full text\ua9 2024 by the authors.In the original publication [1], the funder Cancer Research UK, A2524 was not included. Keith Wheatley, Simon Gates, and Victoria Homer were not included as authors in the original publication. The reason we would like to add the authors is that the statistical element of the trial and the trial design were in a large part done by the statistical authors and the team were necessary for the running of the trial. The corrected Author Contributions Statement appears here. Author Contributions: Conceptualization, S.B., N.A., L.G., M.M., K.W., S.R. and S.C.C.; methodology, K.W., S.G. and V.H.; project administration, S.G. and V.H.; resources, S.B., N.A., L.G., M.M., S.R. and S.C.C.; writing—original draft preparation, S.B., N.A., L.G., M.M., S.R. and S.C.C.; writing—review and editing, S.B., N.A., L.G., M.M., S.R. and S.C.C. All authors have read and agreed to the published version of the manuscript. Author Contributions: Conceptualization, S.B., N.A., L.G., M.M., K.W., S.R. and S.C.C.; methodology, K.W., S.G. and V.H.; project administration, S.G. and V.H.; resources, S.B., N.A., L.G., M.M., S.R. and S.C.C.; writing—original draft preparation, S.B., N.A., L.G., M.M., S.R. and S.C.C.; writing—review and editing, S.B., N.A., L.G., M.M., S.R. and S.C.C. All authors have read and agreed to the published version of the manuscript. Cancer Research UK Clinical Trials Unit, University of Birimingham, Birmingham B15 2TT, UK; [email protected](K.W.); [email protected] (S.G.); [email protected] (V.H.) The authors apologize for any inconvenience caused and state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated
Manned spacecraft external thermal control using the Johnson tube heat pump
No full textIssued as Final report, Project E-25-W41Final report has author: L.G. Johnso
Agricultural Underdevelopment in Caistor Township
No full textTitle: Agricultural Underdevelopment in Caistor Township, Author: Benard W. Darnel, Location: ThodeThe purpose of this study is to describe and explain
the extent of agricultural underdevelopment in Caistor Township. Full credit for the author's incentive to investigate
this area must go to Dr. L.G. Reeds of McMaster University,
who in 1964 conducted a survey of the agricultural conditions
in the Niagara Peninsula, on the basis of which a more detailed
study of several areas, including Caistor Township, seemed
warranted. The information for this study originated from a
variety of sources. The most important of these was direct
observations in the field, which after a brief reconnaissance
survey in the early part of May, were carried out systematically
during the months of June, July, and August of 1966. Interviews
were conducted in all parts of the township, in addition
an attempt was made to interview all people in four sample
block areas. It is estimated that out of a total of 165
interviews, 90 involved the owners of "commercial farms";
other people interviewed were retired farmers, non-farming
residents, township officials, clergy men, and store owners. Field observations provided the basis for the
Land Capability Map (Fig.3), for the map showing "Quality of
Land use" (Fig. 5), while information about the distribution
of non-farm dwellings (Fig . 4) and the location of "Century
Farms" (Fig. 2) was obtained from the township office and
from a 4-H club member respectively. Other pertinent data was provided by the Dominion
Census Report for 1961, which is the most recent source of
information on farm classification, farm income, landuse,
and values of agricultural products sold. Finally, the
Soil Survey of Lincoln County, and the Physiography of
Southern Ontario proved to be useful guides in the assessment
of the physiographic conditions of the township. The methodology employed in this study was selected
so as to best facilitate the attainment of the stated objective,
but limited time for investigation and lack of sufficient
quantitative data about individual farms precluded the use
of statistical methods. The study is divided into eight chapters. Chapters
one, three and four deal exclusively with the physical conditions
and with related problems, while chapter two gives
a brief account of relevant historical factors. Chapters five
and six examine the status of agricultural development in
the township, the findings of which are evaluated in chapter
seven. The final chapter contains the summary and conclusion.ThesisBachelor of Arts (BA
Towards understanding the 3D infrasonic wavefield
No full textIn the evening of 2014, June 03, two explosions occurred at the MSPO-2 plant of Shell Moerdijk. The Cabauw infrasound array detected the infrasound generated by the blasts as two distinct signals. The distance between Shell Moerdijk and the Cabauw infrasound array is 40.5 km. This array is unique as it measures infrasound in 3D. The Fisher analysis is used to process the infrasound signals. The horizontal 2D Fisher analysis veries the infrasound source to be Shell Moerdijk, and it shows an azimuthal deviation of 2.1 caused by the influence of tropospheric crosswinds. The Shell Moerdijk explosions are used as a case study to investigate the measurement of infrasound in 3D. The frequency of the signals detected at the tower has been observed to be lower than the frequency of the signals detected at the surface. A possible reason is that the infrasound signals propagate through small pipes before reaching the tower sensors. Consequently, a reduced coherency between the tower and ground signals exists. Due to this lack of coherency, the 3D Fisher analysis was not able to perform correctly. The signature of the infrasound waveform with altitude is examined in detail, obtained by the vertical measurement of infrasound. It is showing up- and down-going waves in both explosion signals which can only be seen in the 3D vertical measurements. Ray tracing confirms the existence of these different waves. In summary, this research shows the added value of measuring infrasound in 3D.Civil Engineering and GeosciencesGeoscience & EngineeringDouble degree Applied Geophysic
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