scholarly journals Printed matter, nomad matter

Diacrítica ◽  
2020 ◽  
Vol 34 (2) ◽  
pp. 132-147
Author(s):  
Márcia Almeida Oliveira
Keyword(s):  
Women Artists ◽  
Movement Time ◽  
Time History ◽  
Political Regime ◽  
Mail Art ◽  
Artist's Books ◽  
Physical Limitations ◽  
Women's Role ◽  
Different Levels

In a dictatorial or repressive context, movement can be said to be one of the most fundamental and disruptive forms of (aesthetic) resistance. Through exile, migration, travel or correspondence, bodies, ideas and objects are permanently displaced, searching constantly for lines of flight that are impossible to pin down by any political regime. When associated with art, the elusive and ever changing nature of movement can transform objects into events, creating an affective network of images, words, objects, ideas and relations. The ideological potential of movement can be found acutely in artist’s publications, or art in the form of printed matter, such as artist’s books or mail art, which have the potential to circumvent physical limitations imposed by repressive apparatuses. Also, movement triggers imagination to put together all the elements of the network thus constructed and put into motion, also entailing (different levels of) collaboration. This exercise entails taking a closer look to the material and historical circumstances of these objects that become deeply imbedded with ideology. So, by looking at the triangulation movement-time-history, I aim to investigate some ways women artists have used printed matter to revised, confront and debunk totalizing narratives, such as women’s role in society, capitalism, slavery, colonialism, etc., that have been sustained by and have themselves sustained the repressive and dictatorial regimes that operated in Portugal and in Brazil.

scholarly journals The Effect of slit-friction hybrid damper on the Performance of Dual System

2019 ◽  
Vol 13 (1) ◽  
pp. 271-280
Author(s):  
Azadeh Khoshkroodi ◽  
Hossein Parvini Sani
Keyword(s):  
Time History ◽  
Steel Structures ◽  
Repair Cost ◽  
Friction Dampers ◽  
History Analysis ◽  
Different Types ◽  
Moment Resisting ◽  
Hybrid Damper ◽  
Large Earthquakes ◽  
Different Levels

Aims: The aim of the present paper is to evaluate the behavior of slit friction hybrid dampers (SFHD) on steel structures. Therefore, the behavior moment resisting steel frames of structures in original stats and structures equipped with hybrid damper with two different types of behavior was analyzed and evaluated. Background: The recent study evaluated the combined effect of shear-friction dampers and slit dampers with measurements of non-uniform strips in seismic protection for different levels of energy. The recent study was carried out a about hybrid dampers, consisting of friction and split dampers in response to small and large earthquakes. Previous results have shown the ability of inactive hybrid systems in improving the reaction of structures to traditional lateral-systems. Kim and Shin showed that structures consisted of hybrid dampers needed less repair cost and time. Methods: Pushover and time history were carried out on original structures and structures equipped with dampers, in 5 and 10 stories structures. Results: Analysis about the probability of collapse showed about 30% and 84%. Conclusion: According to the result, by adding the SFHD, increased stiffness by 17% in retrofitted structures such as drift and displacement of roof decreases by 27% and 20% in push over analysis, respectively. Also, displacement in time history analysis up to 55% reduces in average. Also, the results of the IDA show that adding the SFHD to structures significantly increases by 55% the spectral acceleration capacity in structures.

Structured Motion Planning in the Local Configuration Space

Robotica ◽  
1991 ◽  
Vol 9 (1) ◽  
pp. 81-92 ◽  
Author(s):  
A. M. S. Zalzala ◽  
A. S. Morris
Keyword(s):  
Configuration Space ◽  
Robot Manipulator ◽  
Time History ◽  
Geometric Constraints ◽  
Polynomial Splines ◽  
Time Motion ◽  
Local Configuration ◽  
Travelling Time ◽  
Physical Limitations ◽  
Manipulator Design

SUMMARYThe minimum-time motion of robot manipulators is solved by defining a suitable time history for the arm end-effector to traverse. As the planning is performed in the configuration space, the uniqueness of the proposed algorithm emerges from the combination of both cubic and quadratic polynomial splines. Furthermore, the highly efficient time optimisation procedure could be applied to local segments of each joint trajectory, leading to a significant reduction of the travelling time. In addition, the ability to perform a search in the work space is granted, exploiting all possible options for an optimum motion. The method proposed considers all realistic physical limitations inherent in the manipulator design, in addition to any geometric constraints imposed on the path. Simulation programs have been written, and results are reported for the Unimation PUMA 560 robot manipulator.

Age as a Factor in Combined Manual and Decision Tasks

1979 ◽  
Vol 21 (5) ◽  
pp. 595-603 ◽  
Author(s):  
Dev S. Kochhar ◽  
Hatem M. Ali
Keyword(s):  
Decision Making ◽  
Heart Rate ◽  
Older Workers ◽  
Movement Time ◽  
Hand Movement ◽  
Movement Control ◽  
Decision Time ◽  
Radial Clearance ◽  
Information Load ◽  
Different Levels

A study was conducted to investigate the variation in speed of performance and decision making ability with age. The task performed involved decision making, hand movement, and positioning elements. The effects of age on decision and movement time were examined when information load, distance of move, and radial clearance (target width) were varied. In addition, heart rate was also monitored. Significant differences were detected in both decision and movement time for different levels of information load, distance of move, and radial clearance between the older (52 to 63 years) and younger (18 to 29 years) groups of subjects. Decision time differences between the two groups increased at higher levels of information load. The relationship between movement time and index of difficulty suggested that the older worker tends to exhibit a “start-up” lag in exercising movement control. Performance errors indicated that the slowing among the older workers was not observed at the expense of accuracy. The study provided no evidence that age has an effect on heart rate variability under different levels of information load and task difficulty.

scholarly journals Investigating Different Levels of Bimanual Interaction With a Novel Motor Learning Task: A Behavioural and Transcranial Alternating Current Stimulation Study

2021 ◽  
Vol 15 ◽  
Author(s):  
Marleen J. Schoenfeld ◽  
Ioana-Florentina Grigoras ◽  
Charlotte J. Stagg ◽  
Catharina Zich
Keyword(s):  
Phase Shift ◽  
Motor Learning ◽  
Movement Time ◽  
Peak Frequency ◽  
Learning Task ◽  
Double Blind Study ◽  
The Novel ◽  
Bimanual Interaction ◽  
Healthy Participants ◽  
Different Levels

Many tasks require the skilled interaction of both hands, such as eating with knife and fork or keyboard typing. However, our understanding of the behavioural and neurophysiological mechanisms underpinning bimanual motor learning is still sparse. Here, we aimed to address this by first characterising learning-related changes of different levels of bimanual interaction and second investigating how beta tACS modulates these learning-related changes. To explore early bimanual motor learning, we designed a novel bimanual motor learning task. In the task, a force grip device held in each hand (controlling x- and y-axis separately) was used to move a cursor along a path of streets at different angles (0°, 22.5°, 45°, 67.5°, and 90°). Each street corresponded to specific force ratios between hands, which resulted in different levels of hand interaction, i.e., unimanual (Uni, i.e., 0°, 90°), bimanual with equal force (Bieq, 45°), and bimanual with unequal force (Biuneq 22.5°, 67.5°). In experiment 1, 40 healthy participants performed the task for 45 min with a minimum of 100 trials. We found that the novel task induced improvements in movement time and error, with no trade-off between movement time and error, and with distinct patterns for the three levels of bimanual interaction. In experiment 2, we performed a between-subjects, double-blind study in 54 healthy participants to explore the effect of phase synchrony between both sensorimotor cortices using tACS at the individual’s beta peak frequency. The individual’s beta peak frequency was quantified using electroencephalography. 20 min of 2 mA peak-to-peak amplitude tACS was applied during task performance (40 min). Participants either received in-phase (0° phase shift), out-of-phase (90° phase shift), or sham (3 s of stimulation) tACS. We replicated the behavioural results of experiment 1, however, beta tACS did not modulate motor learning. Overall, the novel bimanual motor task allows to characterise bimanual motor learning with different levels of bimanual interaction. This should pave the way for future neuroimaging studies to further investigate the underlying mechanism of bimanual motor learning.

Introduction

2019 ◽  
pp. 1-23
Author(s):  
Fred Dallmayr
Keyword(s):  
Nineteenth Century ◽  
Civil Society ◽  
Social Inequality ◽  
Charles Taylor ◽  
Social Darwinism ◽  
Political Regime ◽  
Social Changes ◽  
Social Fragmentation ◽  
Dynamic Character ◽  
Different Levels

The chapter discusses the relation between liberalism and democracy seen as an “odd couple” operating on different levels. Liberalism denotes the practical orientation of members of civil society; democracy is a public-political regime. Initially concordant in modernity, during the nineteenth century, the concord steadily decayed. Several factors—including Social Darwinism, industrialization, and capitalism—drove liberalism into the arms of radical self-assertion, social inequality, and atomization. Leading Western intellectuals have pinpointed the “malaise” of modernity in social fragmentation and the loss of a public democratic realm. Charles Taylor, in particular, has bemoaned narcissism and the neglect of shared frames of meaning. The chapter probes critically the dynamic character of shared frameworks, in particular with regard to globalization, multiculturalism, and other social changes. Only in this manner, it is argued, can the concord of liberalism and democracy be restored. It then reviews the sequence of chapters in light of the preceding themes.

scholarly journals THEORIES OF TOTALITARISM: QUESTION OF OBJECTIVITY

2021 ◽  
Vol 15 (3) ◽  
pp. 5-14
Author(s):  
N.V. Klimenko ◽  
◽  
V. V. Sedov ◽  
I. I. Potapov ◽  
◽  
...  
Keyword(s):  
Comparative Research ◽  
Research Method ◽  
Modern Science ◽  
Scientific Discourse ◽  
Political Regime ◽  
Theoretical Concepts ◽  
Basic Approaches ◽  
Different Levels ◽  
Over Time

Research of totalitarianism in modern science is changing. Over time, it has become clear that it is necessary to revise the basic approaches to the study of this problem. The article is devoted to the research of the main theoretical concepts of totalitarianism of the XX-XXI centuries for their bias. An attempt is made to system-atically analyze existing works in order to identify similar and different features in approaches to the study. The methodology is based on the analysis of the works of leading philosophers and political scientists. The comparative research method helps to see how much scientific works and their authors are engaged. The re-search determines the parallels that exist between the dominant and less widespread views on the phenome-non of totalitarianism. The authors consider different levels of problems that hinder the formation of a de-tached scientific discourse about this phenomenon. The analysis of individual works helps to formulate and understand the main views on this political regime. The main result of the research is the possibility of rais-ing the question of the objectivity of the approaches of European and American scientists in the study of to-talitarianism.

scholarly journals Eye Pointing in Stereoscopic Displays

2016 ◽  
Vol 9 (5) ◽  
Author(s):  
Chiuhsiang Joe Lin ◽  
Retno Widyaningrum
Keyword(s):  
Eye Movement ◽  
Movement Time ◽  
Eye Gaze ◽  
Hand Movement ◽  
Stereoscopic Displays ◽  
Time Index ◽  
Fitts Law ◽  
Different Levels

This study investigated eye pointing in stereoscopic displays. Ten participants performed 18 tapping tasks in stereoscopic displays with three different levels of parallax (at the screen, 20 cm and 50 cm in front of the screen). The results showed that parallax had significant effects on hand movement time, eye movement time, index of performance in hand click and eye gaze. The movement time was shorter and the performance was better when the target was at the screen, compared to the conditions when the targets were seen at 20 cm and 50 cm in front of the screen. Furthermore, the findings of this study supports that the eye movement in stereoscopic displays follows the Fitts’ law. The proposed algorithm was effective on the eye gaze selection to improve the good fit of eye movement in stereoscopic displays.

scholarly journals FACTOR OF DELEGITIMIZATION IN THE PROCESS OF DESTABILIZATION OF THE POLITICAL REGIME

2020 ◽  
Keyword(s):  
Political Institutions ◽  
Political Regime ◽  
The Political ◽  
Number Of Factors ◽  
New Institutions ◽  
Definition Of ◽  
Democratic Transformation ◽  
Institutional Space ◽  
Different Levels

The factors of legitimation and delegitimization of power in the context of the functioning of transitional states are considered and analyzed. The peculiarity of such states is the problem of consolidation of citizens on the basis of common values, the absence of which gradually leads to the delegitimization of the political regime. Particular attention is paid to classical and modern interpretations of legitimacy and related concepts. An understanding of the definition of «legitimacy» is given as an order in which the power of the rulers and the voluntary subordination of the governed, i.e. free recognition by each member of the legal society. It is established that there are different political institutions with different levels of legitimacy in society. The main factors and phases of legitimacy are analyzed, on the example of Ukraine, allocated factors that lead to the delegitimization of a political regime. The problem of the functioning of the institutional process in the post-Soviet states through the phenomenon of double institutionalization, which is characterized by public consent to the functioning of old and new institutions at the same time, is considered separately. The nature of such a phenomenon, which is characterized by a destructive impact on the democratic transformation of society due to the congestion of the new institutional space, has been established. A number of factors of delegitimization of the political regime are analyzed and the classification of factors into economic, geographical, political. The dependence of different factors on different conditions of power is determined. The peculiarity of the delegitimization process in Ukraine, which is characterized by multifactorial with elements of adaptability, has been established. Based on all the theories presented, it is concluded that legitimacy is not only a set of values, it has both cognitive and normative aspects.

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

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