Epistemic Criteria Considered by Pre-service Teachers for Assessing the Quality of a Scientific Investigation About Friction Force

2020 ◽  
Author(s):  
Beatriz Crujeiras-Pérez
Keyword(s):  
Friction Force ◽  
Scientific Investigation ◽  
Epistemic Criteria

scholarly journals Think big: learning contexts, algorithms and data science

2016 ◽  
Vol 8 (2) ◽  
pp. 69-83 ◽  
Author(s):  
Michele Baldassarre
Keyword(s):  
Big Data ◽  
Theoretical Basis ◽  
Data Science ◽  
Scientific Investigation ◽  
Focus Attention ◽  
Learning Contexts ◽  
Quality Of Teaching ◽  
Learning Platforms ◽  
Definition Of

Abstract Due to the increasing growth in available data in recent years, all areas of research and the managements of institutions and organisations, specifically schools and universities, feel the need to give meaning to this availability of data. This article, after a brief reference to the definition of big data, intends to focus attention and reflection on their type to proceed to an extension of their characterisation. One of the hubs to make feasible the use of Big Data in operational contexts is to give a theoretical basis to which to refer. The Data, Information, Knowledge and Wisdom (DIKW) model correlates these four aspects, concluding in Data Science, which in many ways could revolutionise the established pattern of scientific investigation. The Learning Analytics applications on online learning platforms can be tools for evaluating the quality of teaching. And that is where some problems arise. It becomes necessary to handle with care the available data. Finally, a criterion for deciding whether it makes sense to think of an analysis based on Big Data can be to think about the interpretability and relevance in relation to both institutional and personal processes.

scholarly journals ANALYTICAL STUDY OF THE UNLOADING PROCESS OF ELEVATOR BUCKETS

2021 ◽  
Vol 6 (6) ◽  
pp. 71-79
Author(s):  
A. Tihonov ◽  
A. Pol'shin ◽  
N. Lyubimyy ◽  
M. Gerasimov
Keyword(s):  
Friction Force ◽  
High Speed ◽  
Analytical Study ◽  
Theoretical Study ◽  
Bulk Material ◽  
Coriolis Forces ◽  
Advantages And Disadvantages ◽  
Discharge Regime ◽  
Mechanical Phenomena

The purpose of the article is to analyze the main results of the works that are used in the calculations of elevators with moderate speed modes, to clarify the suitability of their individual positions for developing the parameters of centrifugal unloading of high-speed elevators. Works devoted to the study of the operation of high-speed elevators, the results of which have not received a decent interpretation and development, are of considerable interest. As the efficiency of high-speed elevators is determined by the quality of centrifugal unloading and by the operation of the belt-drum mechanism without slipping, there is a need to analyze the work aimed at solving this problem. The paper presents known solutions for determining the parameters of centrifugal unloading, which are based on various hypotheses of the movement of material particles inside the bucket. The physical and mechanical phenomena that affect the movement of material particles in the elevator bucket are studied. The advantages and disadvantages of each hypothesis are revealed. The theoretical study of the process of centrifugal unloading is complicated by the fact that during the movement and exit of the material from the bucket, there is an unstable movement of the bulk material under the influence of a changing system of forces: the forces of attraction, centrifugal and coriolis forces, and the friction force. Meanwhile, even the simplest cases of material motion under a gravitational or mixed discharge regime are difficult to analyze theoretically. In this regard, the dependencies and methods of constructing the trajectories of the material movement are established, as well as the relevance of using a particular equation.

scholarly journals History's Changing Climate: Climate Science, Genomics, and the Emerging Consilient Approach to Interdisciplinary History

2011 ◽  
Vol 42 (2) ◽  
pp. 251-273 ◽  
Author(s):  
Michael McCormick
Keyword(s):  
Climate Science ◽  
Scientific Investigation ◽  
The Other ◽  
Scientific Investigations ◽  
Changing Climate ◽  
The One

Consilience refers to the quality of investigations that draw conclusions from forms of evidence that are epistemologically distinct. The term seems particularly apt for conclusions produced by natural-scientific investigations on the one hand and by historical and archaeological studies on the other. Consilience points to areas of underlying unity of humanistic and scientific investigation— a unity arising from that of reality itself; it represents a convergence in parallel but independent investigations that results in deductions that are much more robust than any investigation would be able to produce on its own.

scholarly journals Nightmares in Migraine: A Focused Review

2021 ◽  
Vol 11 (9) ◽  
pp. 122
Author(s):  
Parisa Gazerani
Keyword(s):  
Physical Symptoms ◽  
Scientific Investigation ◽  
Shortness Of Breath ◽  
Depression And Anxiety ◽  
Quality Of Sleep ◽  
Sleep Phase ◽  
Optimal Care ◽  
Open Questions ◽  
Mental And Physical Health

Nightmares usually occur during the sleep phase of rapid eye movement (REM) and are associated with some physical symptoms, including sweating, shortness of breath, and lower limb movements. Emotions of fear, anger, shame, and sadness may also accompany nightmares. These symptoms can occur during dreaming, upon awakening, or later when the dream experience is recollected. Nightmares may sporadically occur for everyone, but nightmare disorders are associated with features of impaired mental and physical health and require professional medical treatment. The occurrence of nightmares with several disorders has been reported in the literature, but in migraines it has only been investigated in a small number of studies. Considering the existing relationship between sleep disorders and migraine, the occurrence of nightmares in migraine can negatively affect this association and elevate the risk of depression and anxiety. This, in turn, further reduces the quality of life of affected individuals. Hence, expanding the knowledge on the link between nightmares and migraine, promoting an acceptable quantity and quality of sleep through pharmacological and nonpharmacological interventions in the management of nightmares in migraine, and further scientific investigation of the biopsychosocial mechanisms underlying the link, will be highly valuable for optimal care. This focused review, therefore, gives a brief overview of the current understanding of nightmares in migraine to highlight the open questions and value of further research. The ultimate goal is to contribute to timely recognition and sufficient action to offer beneficial outcomes for affected patients.

scholarly journals Problems of Friction Force Measurement between Cylindrical Outdoor and Internal Slide Parts

2018 ◽  
Vol 1 (1) ◽  
pp. 19-25
Author(s):  
Jan Monieta
Keyword(s):  
Friction Force ◽  
Surface State ◽  
Force Measurement ◽  
Surface Condition ◽  
Frictional Resistance ◽  
Experimental Tests ◽  
Technical State ◽  
Force Model ◽  
Factors Affecting

Abstract The article presents the determination of an exemplary measure in the assessment of the technical state of sets of mechanical objects at the stage of manufacture, use and maintenance. The technical state of the assemblies is influenced by the quality of the friction-cooperating elements, the quality of basic functions, the surroundings and the diameter clearance of kinematic node components. Energy wasted to overcome the frictional resistance is a significant part of the energy supplied, which is why current friction losses are minimized. The article includes analysis of the phenomena occurring in the cylindrical pairs in the presence of static and kinetic friction. The many factors affecting the course and values of friction force between cylindrical elements performing relative reciprocating motion have been indicated. The subject of the article is the method of measuring the friction force between a fixed and movable cylindrical element of the mechanical object. The gradual increase of the friction force component takes place by means of easily accessible force. The results of experimental tests of the friction force in different laboratory conditions under are also included. The effect on the measured friction force was investigated: of friction elements geometry and the surface condition after manufacture and/or operation. Scatter results of static friction force depending on the geometry and surface state can be significant. Examples of surface state images are shown. A friction force model was also developed depending on factors affecting its value.

scholarly journals Fragility Fractures: Risk Factors and Management in the Elderly

Medicina ◽  
2021 ◽  
Vol 57 (10) ◽  
pp. 1119
Author(s):  
Filippo Migliorini ◽  
Riccardo Giorgino ◽  
Frank Hildebrand ◽  
Filippo Spiezia ◽  
Giuseppe Maria Peretti ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Risk Factors ◽  
Fragility Fractures ◽  
The Elderly ◽  
Scientific Investigation ◽  
Current Evidence ◽  
Diagnostic Tools ◽  
Socioeconomic Impact ◽  
New Ideas

Given the progressive ageing of Western populations, the fragility fractures market has a growing socioeconomic impact. Fragility fractures are common in the elderly, negatively impacting their quality of life, limiting autonomy, increasing disability, and decreasing life expectancy. Different causes contribute to the development of a fractures in frail individuals. Among all, targeting fragile patients before the development of a fracture may represent the greatest challenge, and current diagnostic tools suffer from limitations. This study summarizes the current evidence on the management of fragility fractures, discussing risk factors, prevention, diagnosis, and actual limitations of the clinical therapeutic options, putting forward new ideas for further scientific investigation.

Effect of environment on drop-outs in rotary head—tape drives

1997 ◽  
Vol 211 (4) ◽  
pp. 349-363 ◽  
Author(s):  
R M Anderson ◽  
B Bhushan
Keyword(s):  
High Temperature ◽  
Relative Humidity ◽  
Friction Force ◽  
Signal Amplitude ◽  
Drop Out ◽  
Tape Drive ◽  
Capacitance Probe ◽  
Drop Outs ◽  
Humidity Environment

The effect of environment on the drop-out performance of magnetic tapes in a rotary head-tape drive was studied. A capacitance probe, mounted on the rotating upper drum and positioned to measure tangential deflection of the head, was used to measure friction force. This technique, in conjunction with the measurement of head signal amplitude, was used to investigate the effect of environment on drop-outs. Streaming mode tests were conducted with two brands of S-VHS tapes at various combinations of temperature (6-38 °C) and relative humidity (10-80% RH). From the experiments, it was found that the propensity for intermittent drop-outs increases in a low relative humidity environment. A low relative humidity environment increases the propensity for debris to persist over the head gap and create a loss in the head signal. High temperature further increases the propensity for drop-outs in a low relative humidity environment. The propensity for intermittent drop-outs is reduced by increasing the relative humidity, changing magnetic tapes and to some extent by lowering the temperature of the environment. It was also determined that variability in the quality of magnetic tapes has a significant impact on the number of intermittent and permanent drop-outs encountered during playback.

POPULATION PHENOMENA IN CERTAIN GAME FISHES OF LAKE SIMCOE, ONTARIO, AND SOME EFFECTS UPON ANGLING RETURNS. PART I. THE SMALLMOUTH BASS, MICROPTERUS DOLOMIEU LACÉPÈDE

1949 ◽  
Vol 27d (1) ◽  
pp. 7-29 ◽  
Author(s):  
Charlotte B. Westman ◽  
James R. Westman
Keyword(s):  
Age Groups ◽  
Smallmouth Bass ◽  
Scientific Investigation ◽  
Micropterus Dolomieu ◽  
Population Densities ◽  
Great Abundance ◽  
Game Fish ◽  
Lake Simcoe ◽  
Improved Methods

The varying susceptibility and availability of game fish populations to angling methods is seldom approached by modern scientific procedure, despite the fact that angling returns are generally accepted as reliable indices of population densities. Lake Simcoe—Ontario's fourth largest lake—afforded an excellent opportunity to study a situation of long standing wherein a great abundance of smallmouth bass had long yielded generally poor angling returns.Results from a scientific investigation, conducted mostly during the summer of 1940, were as follows:(1) A somewhat radical angling method was developed which yields greatly increased and highly satisfactory returns from the bass population.(2) The discovery that shifts in habitat—both diurnal and otherwise—by particular age groups of the smallmouth bass population had a significant effect upon angling returns.(3) The discovery that the smallmouth bass population of the lake was heterogeneous in character, i.e. that bass from one section of the lake had a significantly more rapid rate of growth than bass from another section, and that this influenced the quality of catch.(4) The conclusion that the smallmouth bass problem of Lake Simcoe cannot be solved by stocking; but rather by the dissemination of knowledge on improved methods of utilization.

scholarly journals Double trouble? The communication dimension of the reproducibility crisis in experimental psychology and neuroscience

2020 ◽  
Vol 10 (3) ◽  
Author(s):  
Witold M. Hensel
Keyword(s):  
Experimental Psychology ◽  
Scientific Community ◽  
Scientific Investigation ◽  
Computational Science ◽  
High Rate ◽  
Reporting Standards ◽  
Quality Of Reporting ◽  
Epistemic Dimension ◽  
Epistemic Aspect

Abstract Most discussions of the reproducibility crisis focus on its epistemic aspect: the fact that the scientific community fails to follow some norms of scientific investigation, which leads to high rates of irreproducibility via a high rate of false positive findings. The purpose of this paper is to argue that there is a heretofore underappreciated and understudied dimension to the reproducibility crisis in experimental psychology and neuroscience that may prove to be at least as important as the epistemic dimension. This is the communication dimension. The link between communication and reproducibility is immediate: independent investigators would not be able to recreate an experiment whose design or implementation were inadequately described. I exploit evidence of a replicability and reproducibility crisis in computational science, as well as research into quality of reporting to support the claim that a widespread failure to adhere to reporting standards, especially the norm of descriptive completeness, is an important contributing factor in the current reproducibility crisis in experimental psychology and neuroscience.

scholarly journals Factors associated with the quality of sueño in medical students

2021 ◽  
Vol 7 (3C) ◽  
pp. 95-110
Author(s):  
Jessica Paola Palacios Garay ◽  
Pablo Celestino Olivares Rodriguez ◽  
Jenny Marianella Zavaleta Oliver ◽  
Yanina Gallardo-Lolandes
Keyword(s):  
Medical Students ◽  
Sleep Quality ◽  
Questionnaire Survey ◽  
Scientific Investigation ◽  
Quantitative Approach ◽  
Quality Of Sleep ◽  
Chi Square ◽  
Probability Sampling ◽  
Factors Associated

The present scientific investigation investigated the factors associated with the quality of sleep in medical students. Regarding the methodology, the paradigm of the present study is the positivist one, with a basic quantitative approach that makes it possible to establish associations between the research variables. Regarding the design of the research, it was limited to non-experimental and association of variables. The population was 1,420 students out of 1,420 students and a sample of 820 students was obtained through probability sampling. The technique used was the Pittsburg Sleep Quality Questionnaire Survey (ICSP) (Buysse et al., 1980). The study concluded that the quality of sleep in medical students is associated with the factors sex, age and school from which it comes, obtaining a Chi-square x2 = 84.383a, 196.433a and 422.604a respectively and p <0.05, for which establishes that personal conditions are associated with the quality of sleep in medical students.

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