Balancing chemical equations: The role of developmental level and mental capacity     

Mansoor Niaz  Anton E. Lawson 《科学教学研究杂志》1985,22(1):41-51

Why are some students able to learn to use the trial and error method to balance chemical equations while others are not? To test the hypothesis that formal reasoning is required to balance even simple one-step equations, while formal reasoning and a sufficiently large mental capacity are required to balance more complex many-step equations, a sample of science students was tested to determine level of intellectual development, mental capacity, and degree of field dependence/field independence. Students were then given classroom instruction in using trial and error to balance equations. As predicted, a posttest revealed significant correlations between developmental level and equation balancing ability for both simple and complex equations. Also, as predicted, mental capacity correlated significantly with complex equations but not with simple equations. Field dependence/field independence played no significant role in performance. Educational implications are drawn.  相似文献   

Book Reviews     

Kees Groot  Todd C. Ream  Anton C. Vrame 《Religious education (Chicago, Ill.)》2013,108(1):153-161

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Developing a Model of Medication Adherence among Filipino Elderly     

Allan B. de Guzman  Katrina Illyana J. Guevara  Frances Jane B. Guiang  Anton Lorenzo I. Gutierrez  Alayne S. Habaluyas  Marc Alison P. Hizon 《Educational gerontology》2013,39(5):298-313

While adherence to medication remains a problematic area in the care of chronically ill elderly, an extended model that incorporates the interaction of studied variables remains a blank spot. Anchored on Ajzen's Theory of Planned Behavior, this article details our efforts to develop and test a model of medication adherence among Filipino elderly relative to their medication belief, follow-up visits, consultation satisfaction, memory task, trust with physician, perceived stress, memory strategies, social support, memory load, depression, length of time taking the medication, number of conditions, and self-efficacy with medication adherence. Structural equation modeling (SEM) was employed to study causalities among all parameters. With the participation of 325 older adults located in District IV, Sampaloc, Manila, data needed were gathered through a multiaspect questionnaire consisting of a robotfoto, a memory strategy usage measure, an eight-scale Morisky Medication Adherence Scale, a 15-item Geriatric Depression Scale, a General Self-efficacy Scale, a Consultation Satisfaction Questionnaire, and a Perceived Stress Scale. Data were analyzed using AMOS version 19. Results revealed that depression, trust with physician, and number of conditions affect adherence positively, while event-based memory, consultation satisfaction, memory load, and external memory strategy affect it otherwise. Some suggested variables were found to have no impact at all. As this study reveals, careful consideration should be given to multiple factors, and their interrelationship should be examined well. Because many factors can influence medication adherence behavior of the elderly, and because the reasons for their noncompliance are also varied, multifaceted solutions must be developed.  相似文献   

What underlies successful word problem solving? A path analysis in sixth grade students     

Anton J.H. Boonen  Menno van der SchootFloryt van Wesel  Meinou H. de VriesJelle Jolles 《Contemporary educational psychology》2013

Two component skills are thought to be necessary for successful word problem solving: (1) the production of visual-schematic representations and (2) the derivation of the correct relations between the solution-relevant elements from the text base. The first component skill is grounded in the visual–spatial domain, and presumed to be influenced by spatial ability, whereas the latter is seated in the linguistic–semantic domain, and presumed to be influenced by reading comprehension. These component skills as well as their underlying basic abilities are examined in 128 sixth grade students through path analysis. The results of the path analysis showed that both component skills and their underlying basic abilities explained 49% of students’ word problem solving performance. Furthermore, spatial ability and reading comprehension both had a direct and an indirect relation (via the component skills) with word problem solving performance. These results contribute to the development of instruction methods that help students using these components while solving word problems.  相似文献   

Size-dependent trajectories of DNA macromolecules due to insulative dielectrophoresis in submicrometer-deep fluidic channels   总被引：1，自引：0，他引：1  

Gea O. F. Parikesit  Anton P. Markesteijn  Oana M. Piciu  Andre Bossche  Jerry Westerweel  Ian T. Young    Yuval Garini 《Biomicrofluidics》2008,2(2)

In this paper, we demonstrate for the first time that insulative dielectrophoresis can induce size-dependent trajectories of DNA macromolecules. We experimentally use λ (48.5 kbp) and T4GT7 (165.6 kbp) DNA molecules flowing continuously around a sharp corner inside fluidic channels with a depth of 0.4 μm. Numerical simulation of the electrokinetic force distribution inside the channels is in qualitative agreement with our experimentally observed trajectories. We discuss a possible physical mechanism for the DNA polarization and dielectrophoresis inside confining channels, based on the observed dielectrophoresis responses due to different DNA sizes and various electric fields applied between the inlet and the outlet. The proposed physical mechanism indicates that further extensive investigations, both theoretically and experimentally, would be very useful to better elucidate the forces involved at DNA dielectrophoresis. When applied for size-based sorting of DNA molecules, our sorting method offers two major advantages compared to earlier attempts with insulative dielectrophoresis: Its continuous operation allows for high-throughput analysis, and it only requires electric field strengths as low as ∼10 V∕cm.  相似文献   

How Do Humans Acquire Knowledge? And What Does That Imply About the Nature of Knowledge?     

Lawson  Anton E. 《Science & Education》2000,9(6):577-598

This paper offers a resolution to the debate between constructivists andrealists regarding the epistemological status of human knowledge. Evidence in the form of three case studies and one experimentalstudy is presented. The conclusion drawn is that knowledge acquisitioninvolves a pattern of idea (representation) generation and test that, whencast in the form of a verbal argument, follows an If/then/Thereforepattern. Self-generated ideas/representations are tested by comparingexpected and observed outcomes. Ideas may be retained or rejected,but can not be proved or disproved. Therefore, absolute Truth aboutany and all ideas, including the idea that the external world exists, isunattainable. Yet learning at all levels above the sensory-motor requiresthat one assume the independent existence of the external world becauseonly then can the behavior of the objects in that world be used to testsubsequent higher-order ideas. In the final analysis, ideas – includingscientific hypotheses and theories – stand or fall, not due to socialnegotiation, but due to their ability to predict future events. Althoughthe knowledge acquisition process has limitations, its use neverthelessresults in increasingly useful representations about an assumed to existexternal world as evidenced by technological progress that is undeniablybased on sound scientific theory. The primary instructional implicationis that science instruction should remain committed to helping studentsunderstand the crucial role played by hypotheses, predictions and evidencein learning.  相似文献   

The effect of inspiratory muscle fatigue on acid-base status and performance during race-paced middle-distance swimming     

Mitch Lomax  Jernej Kapus  Samuel Webb  Anton Ušaj 《Journal of sports sciences》2019,37(13):1499-1505

The aim of this study was to investigate the effect of pre-induced inspiratory muscle fatigue (IMF) on race-paced swimming and acid-base status. Twenty-one collegiate swimmers performed two discontinuous 400-m race-paced swims on separate days, with (IMF trial) and without (control trial) pre-induced IMF. Swimming characteristics, inspiratory and expiratory mouth pressures, and blood parameters were recorded. IMF and expiratory muscle fatigue (P < 0.05) were evident after both trials and swimming time was slower (P < 0.05) from 150-m following IMF inducement. Pre-induced IMF increased pH before the swim (P < 0.01) and reduced bicarbonate (P < 0.05) and the pressure of carbon dioxide (PCO₂) (P < 0.05). pH (P < 0.05), bicarbonate (P < 0.01) and PCO₂ (P < 0.05) were lower during swimming in the IMF trial. Blood lactate was similar before both trials (P > 0.05) but was higher (P < 0.01) in the IMF trial after swimming. Pre-induced IMF induced respiratory alkalosis, reduced bicarbonate buffering capacity and slowed swimming speed. Pre-induced and propulsion-induced IMF reflected metabolic acidosis arising from dual role breathing and propulsion muscle fatigue.  相似文献   

The relationships between pelvic range of motion,step width and performance during an athletic sprint start     

Paul Sandamas  Elena M. Gutierrez-Farewik  Anton Arndt 《Journal of sports sciences》2020,38(19):2200-2207

ABSTRACT

The aims of this study were (a) to describe the kinematics underlying the phenomenon of the knee of the swing leg passing medially in front of the athlete during the single push (SP) phase of the block sprint start, and (b) to determine the relationships between block phase pelvis range of motion (RoM), 1^st step width and block phase performance. Three-dimensional kinematic data (250 Hz) were collected from eleven competitive sprinters (100 m PB: 11.17 ± 0.41) performing maximal effort block starts. The joint angles of the rear hip with respect to the pelvis and the pelvis segment angles with respect to the laboratory coordinate system were calculated during the block start phase to the end of the 1^st stance. A combination of pelvis list and rotation (not hip adduction) was coupled with the thigh of the swing leg moving medially during the SP phase. A very high positive correlation was found between pelvic list RoM and 1^st step width (r = 0.799, p = 0.003). No other significant correlations were found. Attempting to reduce pelvic RoM or changing frontal and transverse plane hip joint angles to minimise medial thigh motion is unlikely to lead to an improvement to performance.  相似文献   

Internal versus External Assessment in the Dutch Examinations at 16+ and 18+     

Anton J. M. Luijten 《教育心理学》1988,8(4):237-246

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Author's response     

Anton E. Lawson 《科学教学研究杂志》1985,22(8):763-765

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