303 research outputs found
Tracing the building of Robert's connections in mathematical problem solving: a sixteen-year study
No full textThis research analyzes how external representations created by a student, Robert, helped him in building mathematical understanding over a sixteen-year period. Robert (also known as Bobby), was an original participant of the Rutgers longitudinal study where students were encouraged to work on problem-solving tasks with minimum intervention (Maher, 2005). The research demonstrates how Robert built robust counting techniques by tracing the evolvement of his problem-solving heuristics, strategies, justifications and external representations. The study also examines how Robert made connections to his earlier problem solving. In addition, the origins of Robert’s ideas related to Pascal’s Triangle and Pascal’s Pyramid are investigated. Fifteen sessions were selected between Robert’s fifth grade (February 26, 1993) and post-graduate interviews (March 27, 2009) yielding more than twenty hours of video data. Powell, Francisco, and Maher (2003) model was used for analysis where by each session was viewed, transcribed and coded for critical events to create a comprehensive narrative. The study reveals that mature combinatorial techniques were a part of Robert’s counting strategies as early as middle school. Robert used binary notation to count two-colored candle arrangements and later to count the number of ways a team could win a World Series; modified exponential formulae to account for combinations for a garage door opener, arrangements for n-colored candles and n-toppings pizzas; discovered the combinations formula, C(n, 2), in his eleventh grade; and connected these solutions to Pascal’s identities. In general, Robert looked for patterns in his solutions; generalized the findings; and identified structural similarities in tasks presented to him as he connected three-position garage door opener to three-colored candles arrangements, pizza with four toppings to towers four high, and directions on Pascal’s Triangle to routes for a taxi on a two-dimensional grid. External representations created by Robert served as communication tools for him and provided insight into his problem solving heuristics and mathematical understanding. The research contributes to the growing body of case studies from Rutgers longitudinal study providing evidence that building of early mathematical ideas is the foundation of more advanced learning (Davis & Maher, 1997).Ph.D.Includes bibliographical referencesIncludes vitaby Anoop Ahluwali
Third Revision of the Global Surface Seawater Dimethyl Sulfide Climatology (DMS-Rev3)
No full textThis dataset contains all the input data and the Matlab codes for the Third Revision of the Global Surface Seawater Dimethyl Sulphide Climatology (DMS-Rev3)
Shrivardhan Hulswar, Rafel Simo, Martí Galí, Thomas G. Bell, Arancha Lana, Swaleha Inamdar, Paul R. Halloran, George Manville and Anoop S. Mahajan
*corresponding author: Anoop Sharad Mahajan ([email protected])
Details to run the code can be found in the word file: Code details.doc
Third Revision of the Global Surface Seawater Dimethyl Sulfide Climatology (DMS-Rev3)
No full textThis dataset contains all the input data and the Matlab codes for the Third Revision of the Global Surface Seawater Dimethyl Sulphide Climatology (DMS-Rev3)Shrivardhan Hulswar, Rafel Simo, Martí Galí, Thomas G. Bell, Arancha Lana, Swaleha Inamdar, Paul R. Halloran, George Manville and Anoop S. Mahajan*corresponding author: Anoop Sharad Mahajan ([email protected])Details to run the code can be found in the word file: Code details.docxTHIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV
Quality Assurance (BS 5750) in Social Services Departments
No full textQuality assurance is concentrated in manufacturing and over the
last three to four years there has been an upsurge of interest in the
public sector. Focuses on local authority social services departments,
but literature and the implementation of quality assurance in the social
services is very limited, particularly in specific areas such as Meals
on Wheels, home care services and children′s homes. Provides an
understanding of the requirements of implementing Quality Assurance
(BS5750) in Social Services, particularly the Meals on Wheels service.
Gives a brief outline of what is quality assurance and BS5750. Aims to
provide social service practitioners with insight and guidance to the
requirements of introducing BS5750 for the Meals on Wheels service.</jats:p
Assessing Total Quality Training in Wales
No full textPresents survey results of training for quality in manufacturing
companies in Wales. Six geographical areas – Cardiff, Newport, Swansea,
Llandudno, Shrewsbury and Llandrindod Wells, in Wales, were selected for
investigation. A high response rate indicates a “renaissance” in quality
in manufacturing in Wales. Quality is recognized by many organizations
in Wales and results show that companies are beginning to address
training in quality requirements. The Wales Quality Centre is used by a
large percentage of the companies surveyed.</jats:p
The long view of total quality management pays off
No full textUses a review of literature to examine quality in the context of
its current understanding thinking by advocates of total quality
management (TQM). It must be realized that TQM is not a short‐term fix.
It demands thorough preparation, unbending commitment, clear direction
from management and, above all, patience. Rising consumer expectations
are forcing industries to reevaluate existing practices and improve
them. To achieve competitive supremacy all organizations in Europe and
worldwide will need to take a long‐term strategic view of TQM. Looks at
a manufacturing company in the North of England which is laying down the
foundations for implementing TQM.</jats:p
Multi-Level Medium Voltage Inverter for Dc Distributed Wind Farm to Establish Grid Interface and Provide Ancillary Support
No full textWind energy has gained in popularity in recent years due to cost, security and environmental concerns associated with conventional energy sources like fossil fuels. However, the utilization of wind energy in power systems creates many technical and non-technical challenges that need to be addressed for successful integrations. The main technical issues related to wind energy are its uncertainty and variability and their impacts on stability, reliability and quality of the electric power. In systems with high wind energy penetrations, unlike conventional generations, sudden changes in active and/or reactive power demand cannot be supported by wind energy. This lack of demand support may create unwanted voltage and frequency variations in the grid. On the hand, the existing AC distributed wind farms have several drawbacks including complexity, higher cost, and lower efficiency. In this dissertation, a medium voltage direct current (MVDC) distribution system for wind farms is investigated. The proposed system offers higher reliability, lower cost, higher efficiency and more importantly grid support. It also allows for easier integration of energy storage systems at DC level. Design, control, implementation, and testing of a three-level medium voltage inverter are presented. The inverter can provide active and reactive power support to the grid in case of frequency and voltage droops. Simulation and experimental results are presented to verify the viability of the proposed system and control techniques
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Two stories from "Trishanku Aur Anya Kahaniyam", by Mannu Bhandari. A translation and commentary
No full textMannu Bhandari is a critically-acclaimed author in contemporary India. The two stories from Trishanku Aur Anya Kahaniyam (Trishanku and Other Stories), "Trishanku" and "Darar Bharne Ki Darar" ("The Rift of Filling in the Rift"), are presented translated from the original Hindi into English. These stories, written from the viewpoint of adolescent female narrators, explore the concept of rebelling against long-established tradition in India, seen from the standpoint of young persons seeking maturity. Each contains a 'story within a story' wherein a marriage is highlighted: one a non-traditional 'love-marriage,' and the other a traditional, arranged marriage which is unhappy. In addition, there is a commentary in which facets of Mannu Bhandari's literary skill and implications of the above-mentioned themes are considered, and various problems of translating from the Hindi language into English while trying to do justice to a consummate artist are discussed
On the Nonlinear Tribological Jerk Dynamics at Sliding Interfaces
No full textAs the world desires the next industrial revolution, the potential threats that will undermine energy efficient innovations include detrimental frictional effects that exacerbate wear, hasten equipment breakdowns, and worsen heat dissipation. Capturing the inherently nonlinear manifestations of friction fundamentally has been difficult. A fundamental modeling scheme elucidating friction will bolster novel technologies synthesizing wear resistant materials and lubricants needed for sustainable energy efficiency. Frictional dissipation at dynamical sliding interfaces has been studied for generations. Interfacial sliding frictional effects are prevalent in natural and artificial phenomena such as earthquake, hip and knee joints, and the moving parts of energy-producing and energy-consuming equipment. Hitherto, despite significant research efforts, no consensus fundamental modeling technique exists that deterministically ties friction with system degradation. Yet, elucidating the basic physics of nonlinear friction-resisted motion will clarify how heat generation, efficiency, lubrication, wear, and material lifetime evolve in sliding contacts. In this study, we unify Newtonian mechanics with classical thermodynamics to elicit nonlinear tribological jerk dynamics at a sliding interface. Jerk, the rate of change of acceleration has been elusive in classical mechanics. By showing jerk originating in a friction-resisted motion a new fundamental scientific modeling tool emerges. For example, although Coulomb's law of friction precludes significant friction-velocity coupling our reassessment using jerk dynamics results shows otherwise. We find Coulomb's law may seemingly be an oversimplification by reproducing the Stribeck effect known to capture friction-velocity coupling. Furthermore, negative frictional jerk opposes relative motion while positive lubricating jerk supports relative motion. A frictionless unconstrained motion recaptures constant acceleration Newtonian-Galilean mechanics. Using the kinematic and dynamic results as inputs, we quantified wear and wear rates, subsurface temperature and mechanical sliding efficiency. Our modeling results quantitatively match experimental results from tribometer and thermal compliance tests very well. We constructed an analytical algebraic partitioning technique to solve the jerk balance equations which are third order and nonlinear ordinary differential equations. The algebraic technique works well and may facilitate engineering and scientific modeling efforts. By placing jerk in basic physics context, we proffer a fundamental tool that likely will transform how relative motions in artificial and natural phenomena are modeled.2017-06-0
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