Developing a model of mathematical wellbeing through a thematic analysis of the literature

Globally, many students experience low mathematical wellbeing, defined here as the fulfilment of one’s core values, accompanied by positive feelings and functioning in the mathematics classroom. To increase positive feelings about and engagement in mathematics, there is a need to better understand students’ values and align practices to supporting these values. We report on a scoping review of 40 mathematics education publications. Student values in mathematics education could be categorised into seven wellbeing dimensions, namely accomplishment, cognitions, engagement, meaning, perseverance, positive emotions, and relationships. The resulting seven-dimensional mathematical wellbeing model points to target areas to build student mathematical wellbeing

Stiffness and Damping Properties of a Low Aspect Ratio Shear Wall Building Based on Recorded Earthquake Responses

An investigation into the structural properties and seismic responses of a low aspect ratio shear wall building, which has construction similarity to typical nuclear plant structures, has been performed using actual recorded earthquake motions. This effort used a combination of modal identification to obtain structure modal parameters directly from the recorded motions, and elastic structural analysis using methods and criteria frequently employed by the nuclear industry. Modal parameters determined by modal identification provide excellent fits to the building motions recorded during the 1984 Morgan Hill earthquake. Modal parameters identified for the 1989 Lorna Prieta earthquake are more uncertain. Investigation of building stiffnesses generally confirms the adequacy of bounding estimates currently recommended for nuclear plant structure seismic analysis. Damping values identified for this building supplement the database being compiled to investigate current nuclear plant structure damping criteria

A Guyon's canal ganglion presenting as occupational overuse syndrome: A case report

<p>Abstract</p> <p>Background</p> <p>Occupational overuse syndrome (OOS) can present as Guyon's canal syndrome in computer keyboard users. We report a case of Guyon's canal syndrome caused by a ganglion in a computer user that was misdiagnosed as OOS.</p> <p>Case presentation</p> <p>A 54-year-old female secretary was referred with a six-month history of right little finger weakness and difficulty with adduction. Prior to her referral, she was diagnosed by her general practitioner and physiotherapist with a right ulnar nerve neuropraxia at the level of the Guyon's canal. This was thought to be secondary to computer keyboard use and direct pressure exerted on a wrist support. There was obvious atrophy of the hypothenar eminence and the first dorsal interosseous muscle. Both Froment's and Wartenberg's signs were positive. A nerve conduction study revealed that both the abductor digiti minimi and the first dorsal interosseus muscles showed prolonged motor latency. Ulnar conduction across the right elbow was normal. Ulnar sensory amplitude across the right wrist to the fifth digit was reduced while the dorsal cutaneous nerve response was normal. Magnetic resonance imaging of the right wrist showed a ganglion in Guyon's canal. Decompression of the Guyon's canal was performed and histological examination confirmed a ganglion. The patient's symptoms and signs resolved completely at four-month follow-up.</p> <p>Conclusion</p> <p>Clinical history, occupational history and examination alone could potentially lead to misdiagnosis of OOS when a computer user presents with these symptoms and we recommend that nerve conduction or imaging studies be performed.</p

Special based isolation system for low-rise RC building

In the past decade, there were a lot of seismic activities around the world that cause low rise reinforced concrete suffered severe damage and total collapse. A special based isolation system can be equipped to the low rise building to prevent it from damaged and collapse by improving the period, stiffness and damping of the structures. The based isolation system can increase the natural period of a rigid structure under first mode shape by applying low stiffness rubber isolators. These method can provide a better structural behaviour of low rise RC building as compared to moderate or high stiffness rubber isolators. Furthermore, the special based isolation system with maximum damping of 15% for 4 storey and 6 storey RC building. However, the value of optimum damping depends upon the characteristics of ground motions and frequencies of the earthquakes

Simulation of Internal Undular Bores Propagating over a Slowly Varying Region

Internal undular bores have been observed in many parts of the world. Studies have shown that many marine structures face danger and risk of destruction caused by internal undular bores due to the amount of energy it carries. This paper looks at the transformation of internal undular bore in two-layer fluid flow under the influence of variable topography. Thus, the surface of the bottom is considered to be slowly varying. The appropriate mathematical model is the variable-coefficient extended Korteweg-de Vries equation. We are particularly interested in looking at the transformation of KdV-type and table-top undular bore over the variable topography region. The governing equation is solved numerically using the method of lines, where the spatial derivatives are first discretised using finite difference approximation so that the partial differential equation becomes a system of ordinary differential equations which is then solved by 4th order Runge-Kutta method. Our numerical results show that the evolution of internal undular bore over different types of varying depths regions leads to a number of adiabatic and non-adiabatic effects. When the depth decreases slowly, a solitary wavetrain is observed at the front of the transformed internal undular bore. On the other hand, when the depth increases slowly, we observe the generation of step-like wave and weakly nonlinear trailing wavetrain, the occurrence of multi-phase behaviour, the generation of transformed undular bore of negative polarity and diminishing transformed undular bore depending on the nature of the topography after the variable topography

Characterization and population dynamics of Toluene-degrading bacteria in a contaminated freshwater stream

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.Includes bibliographical references.Stephen T.-L. Tay.Ph.D

Geotechnical Properties of Malaysian Organic Soils: Case Study in Batu Pahat, Johor

Subsurface exploration is required before any development project in order to gain an understanding of the characteristics of the material that one will encounter. The type of the tests and exploration are normally specified based on the design requirement in accordance to respective code of practice. In general, the physical properties and strength of the material are important in civil engineering applications. However, the chemical contents and organic contents are only specified sometimes when necessary despite the fact that the physical and strength of the material are closely related to its chemical properties and organic contents. In most construction works, the top soil and peat soil which are highly organic will be removed prior to carrying out construction work which resulted in exposing the bottom layer of soil. Hence, the aim of this study is to determine the geotechnical properties of the organic soils at the interface layer of peat soil and inorganic soil which normally exposed after removing top soil and peat soil at the surface. The physical &amp; chemical properties, strength and organic contents of the soils are determined in accordance to the BS1377:1990 and BS ISO 13320:2009. Three locations which are identified to be rich in organic soils namely Parit Nipah, Parit Sidek and Batu Puteh of Batu Pahat, were chosen in this case study. These locations are found to be difference geographically. The soil samples were collected using a peat auger at Parit Nipah and Batu Puteh while undisturbed tube sampler was used at Parit Sidek because the soil is too stiff to be sampled using peat auger. The findings of this study showed that the physical properties of the soil are strongly correlated with its organic content. However, the chemical properties and strength of the soil is found to be site dependent and poorly correlated to its organic content.&nbsp; &nbsp; &nbsp

Viable Mice with Extensive Gene Humanization (25-kbp) Created Using Embryonic Stem Cell/Blastocyst and CRISPR/Zygote Injection Approaches.

Here, we describe an expansion of the typical DNA size limitations associated with CRISPR knock-in technology, more specifically, the physical extent to which mouse genomic DNA can be replaced with donor (in this case, human) DNA at an orthologous locus by zygotic injection. Driving our efforts was the desire to create a whole animal model that would replace 17 kilobase pairs (kbp) of the mouse Bcl2l11 gene with the corresponding 25-kbp segment of human BCL2L11, including a conditionally removable segment (2.9-kbp) of intron 2, a cryptic human exon immediately 3\u27 of this, and a native human exon some 20 kbp downstream. Using two methods, we first carried out the replacement by employing a combination of bacterial artificial chromosome recombineering, classic embryonic stem cell (ESC) targeting, dual selection, and recombinase-driven cassette removal (ESC/Blastocyst Approach). Using a unique second method, we employed the same vector (devoid of its selectable marker cassettes), microinjecting it along with redundant single guide RNAs (sgRNAs) and Cas9 mRNA into mouse zygotes (CRISPR/Zygote Approach). In both instances, we were able to achieve humanization of Bcl2l11 to the extent designed, remove all selection cassettes, and demonstrate the functionality of the conditionally removable, loxP-flanked, 2.9-kbp intronic segment

Numerical Simulation of undular bore evolution with chezy friction, 2015

This paper studies and simulates numerically the evolution of undular bore under the effect of damping in the framework of the perturbed extended Korteweg-de Vries equation. Here, we consider Chezy frictional term to be the damping term in the perturbed extended Korteweg-de Vries equation. Numerical simulations show that under the influence of the friction, the undular bore with thick leading wave will transform into KdV-like solitary wave as the leading wave of the undular bore. The amplitude of the "thick" leading wave will remain the same for some time even though there is dissipation effect