887 research outputs found
Soft commitment: a study on demand and compliance
This article explores the demand for soft, self-imposed commitment, and subsequent compliance behaviour, using a framed field study in a higher education setting. We find a substantial soft commitment demand and a remarkably high failure to comply with the chosen commitment.Students are more likely to demand soft commitment if they expect the task to be more time-consuming and their relative performance to be lower. Failure to comply is associated with previous grade and personality traits. We find no evidence that soft commitment affects grades
Hierarchically nested factor model from multivariate data
We show how to achieve a statistical description of the hierarchical
structure of a multivariate data set. Specifically we show that the similarity
matrix resulting from a hierarchical clustering procedure is the correlation
matrix of a factor model, the hierarchically nested factor model. In this
model, factors are mutually independent and hierarchically organized. Finally,
we use a bootstrap based procedure to reduce the number of factors in the model
with the aim of retaining only those factors significantly robust with respect
to the statistical uncertainty due to the finite length of data records.Comment: 7 pages, 5 figures; accepted for publication in Europhys. Lett. ; the
Appendix corresponds to the additional material of the accepted letter
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Results from the Second International Module Intercomparison
The peak-watt rating is a primary indicator of PV performance. The peak power rating is the maximum electrical power that is produced when the PV device is continuously illuminated at 1000 Wm/sup-2/ total irradiance under International Electrotechnical Commission Standard 60904-2 reference spectrum, and 25 deg C cell temperature. Most manufacturers trace their peak-watt rating through calibrations performed at recognized terrestrial calibration facilities. Manufacturers typically perform intercomparisons among a set of their modules internally with other plants and among. Sometimes they have the same module measured at different calibration facilities to determine the differences in calibration. This intercomparison was to mimic this procedure and supply new thin film samples along with samples that could pose other problems. These intercomparisons sample the laboratories' everyday procedures better than a formal intercomparison where the laboratories' best procedures and data scrutiny are used
Cost-effectiveness of alternative methods of surgical repair of inguinal hernia
Objectives: To assess the relative cost-effectiveness of laparoscopic methods of inguinal hernia repair compared with open flat mesh and open non-mesh repair. Methods: Data on the effectiveness of these alternatives came from three systematic reviews comparing: (i) laparoscopic methods with open flat mesh or non-mesh methods; (ii) open flat mesh with open non-mesh repair; and (iii) methods that used synthetic mesh to repair the hernia defect with those that did not. Data on costs were obtained from the authors of economic evaluations previously conducted alongside trials included in the reviews. A Markov model was used to model cost-effectiveness for a five-year period after the initial operation. The outcomes of the model were presented using a balance sheet approach and as cost per hernia recurrence avoided and cost per extra day at usual activities. Results: Open flat mesh was the most cost-effective method of preventing recurrences. Laparoscopic repair provided a shorter period of convalescence and less long-term pain compared with open flat mesh but was more costly. The mean incremental cost per additional day back at usual activities compared with open flat mesh was €38 and €80 for totally extraperitoneal and transabdominal preperitoneal repair, respectively. Conclusions: Laparoscopic repair is not cost-effective compared with open flat mesh repair in terms of cost per recurrence avoided. Decisions about the use of laparoscopic repair depend on whether the benefits (reduced pain and earlier return to usual activities) outweigh the extra costs and intraoperative risks. On the evidence presented here, these extra costs are unlikely to be offset by the short-term benefits of laparoscopic repair.Luke Vale, Adrian Grant, Kirsty McCormack, Neil W. Scott and the EU Hernia Trialists Collaboratio
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Long-Term Performance Data and Analysis of CIS/CIGS Modules Deployed Outdoors
The long-term performance data of copper indium diselenide (CIS) and gallium-alloyed CIS (CIGS) photovoltaic (PV) modules are investigated to assess the reliability of this technology
Transpiration efficiency: new insights into an old story
Producing more food per unit of water has never been as important as it is at present, and the demand for water by
economic sectors other than agriculture will necessarily put a great deal of pressure on a dwindling resource, leading
to a call for increases in the productivity of water in agriculture. This topic has been given high priority in the research
agenda for the last 30 years, but with the exception of a few specific cases, such as water-use-efficient wheat in
Australia, breeding crops for water-use efficiency has yet to be accomplished. Here, we review the efforts to harness
transpiration efficiency (TE); that is, the genetic component of water-use efficiency. As TE is difficult to measure,
especially in the field, evaluations of TE have relied mostly on surrogate traits, although this has most likely resulted in
over-dependence on the surrogates. A new lysimetric method for assessing TE gravimetrically throughout the entire
cropping cycle has revealed high genetic variation in different cereals and legumes. Across species, water regimes,
and a wide range of genotypes, this method has clearly established an absence of relationships between TE and total
water use, which dismisses previous claims that high TE may lead to a lower production potential. More excitingly,
a tight link has been found between these large differences in TE in several crops and attributes of plants that make
them restrict water losses under high vapour-pressure deficits. This trait provides new insight into the genetics of TE,
especially from the perspective of plant hydraulics, probably with close involvement of aquaporins, and opens new
possibilities for achieving genetic gains via breeding focused on this trait. Last but not least, small amounts of water
used in specific periods of the crop cycle, such as during grain filling, may be critical. We assessed the efficiency of
water use at these critical stages
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Stability of CIS/CIGS Modules at the Outdoor Test Facility over Two Decades: Preprint
This paper discusses examining the status and question of long-term stability of copper indium diselenide (CIS) photovoltaic (PV) module performance for numerous modules that are deployed in the array field, or on the roof of, the outdoor test facility (OTF) at NREL, acquired from two manufacturers
Polymer patterning by laser-induced multi-point initiation of frontal polymerization
Frontal polymerization (FP) is an approach for thermosetting plastics at
lower energy cost than an autoclave. The potential to generate simultaneous
propagation of multiple polymerization fronts has been discussed as an exciting
possibility. However, FP initiated at more than two points simultaneously has
not been demonstrated. Multi-point initiation could enable both large scale
material fabrication and unique pattern generation. Here the authors present
laser-patterned photothermal heating as a method for simultaneous initiation of
FP at multiple locations in a 2-D sample. Carbon black particles are mixed into
liquid resin (dicyclopentadiene) to enhance absorption of light from a
Ti:Sapphire laser (800 nm) focused on a sample. The laser is time-shared by
rapid steering among initiation points, generating polymerization using up to
seven simultaneous points of initiation. This process results in the formation
of both symmetric and asymmetric seam patterns resulting from the collision of
fronts. The authors also present and validate a theoretical framework for
predicting the seam patterns formed by front collisions. This framework allows
the design of novel patterns via an inverse solution for determining the
initiation points required to form a desired pattern. Future applications of
this approach could enable rapid, energy-efficient manufacturing of novel
composite-like patterned materials
A Comparative Study of Efficient Initialization Methods for the K-Means Clustering Algorithm
K-means is undoubtedly the most widely used partitional clustering algorithm.
Unfortunately, due to its gradient descent nature, this algorithm is highly
sensitive to the initial placement of the cluster centers. Numerous
initialization methods have been proposed to address this problem. In this
paper, we first present an overview of these methods with an emphasis on their
computational efficiency. We then compare eight commonly used linear time
complexity initialization methods on a large and diverse collection of data
sets using various performance criteria. Finally, we analyze the experimental
results using non-parametric statistical tests and provide recommendations for
practitioners. We demonstrate that popular initialization methods often perform
poorly and that there are in fact strong alternatives to these methods.Comment: 17 pages, 1 figure, 7 table
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Forward-Biased Thermal Cycling: A New Module Qualification Test
Following a proposal by BP Solarex to modify the standard module qualification sequence, we performed a forward-biased themal cycling on three types of commercial modules to evaluate the procedure. The total number of thermal cycles was doubled to 400 and maximum power measurements were made every 50 cycles
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