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Michael E. Brown's book, The Concept of the Social in Uniting the Humanities and Social Sciences, demonstrates that prominent attempts to account for the social dimension of human affairs rely on an unstated notion of a “course of activity,” that is diametrically opposed to the conceptualization of sociality that is presumably intended to realize it. I want to focus on the idea of a “course of activity” in order to locate his work in and clarify its importance to the development of dialectical reason from Heraclitus through Hegel and beyond. Of special importance is the bearing of his research on the critique of contemporary theories of agency and sociality, and, since considerable attention has been paid, in this regard, to the arts and humanities, some of what I will say about this refers to art and its avant-garde moments—-particularly in my work on Dada and Brown's account of two avant-garde theatrical performances. 

This chapter examines what is entailed by separating agency from individuality and what it means for the idea of a “course of activity,” (going on) and its relation to the concept of sociality. This also bears on questions of ontology, as Brown's course of activity is generative and nonrepeatable. The course of activity and nonrepeatability are linked to both avant-garde practice and theoretical notions that reframe our temporal understandings. These include the avant-garde of dada and surrealism, and the reformulations of bourgeois time of Jean Duvignaud, Walter Benjamin, Ernst Bloch, and Jean-Paul Sartre. The question raised here is that of a teleological understanding—how we link the present course of activity with future events.

The purpose of this paper is to calculate the meshing stiffness of nutation face gear considering the roughness, establish the calculation method of time-varying meshing stiffness of rough tooth surface and analyze the influence of roughness, load and other factors on the meshing stiffness of tooth surface.

The Weierstrass–Mandelbrot (W-M) function in the Majumdar–Bhushan model is used to characterize the rough contact line of the tooth surface, the normal height and radius of the micro convex body are calculated and the contact flexibility of the contact point of the tooth surface is obtained. The contact flexibility and the bending shear deformation flexibility obtained previously are substituted into the improved deformation compatibility equation for iterative calculation, and the time-varying meshing stiffness of the nutation face gear considering the roughness is obtained.

Compared with ABAQUS finite element simulation results, it is found that the meshing stiffness curve of rough tooth surface is more gentle than that of smooth tooth surface, the meshing stiffness value is smaller and the meshing stiffness change is smaller at the position where the number of gear teeth coincide changes.

In the process of calculating contact deformation, the fractal theory W-M function is used to characterize the contact line of the rough nutation face gear, and the deformation coordination condition considering roughness is improved. Therefore, the method of time-varying meshing stiffness considering roughness can obtain more accurate results, which provides theory and data for the subsequent dynamics analysis of the nutation face gear transmission.

This paper attempts to explore why adult progeny initiate progeny–parents family travel, how two generations interact and deal with intergenerational conflicts during travel and how they evaluate their travel experiences from the perspective of filial piety.

Based on in-depth interviews with both parents and their adult progeny, it is found that “repayment” or “compensation” of filial piety is the most important driving force to family travel with parents, and in many cases an adult child exhibits “overspending” by showing filial obedience. On the other hand, parents occasionally utilize filial piety as cultural resources to fulfill their personal goals and to evaluate their interactions with adult children. Finally, the authors offer an exploratory explanation to why filial generation has a relatively low evaluation while parent generation has a higher evaluation of family trip.

The authors suggest that future study in this particular area should attach much more importance to the “filial piety tool boxes” paradigm, which is in parallel with the paradigm of “concept (values) affecting behavior”.

The contribution of this study is to investigate the family travel process of “taking the elderly people to travel” from the perspective of interaction and filial piety.

To provide a general review of the flight flutter test techniques utilized in aeroelastic stability flight testing of aircraft, and to highlight the key items involved in flight flutter testing of aircraft, by emphasizing all the main information processed during the flutter stability verification based on flight test data.

Flight flutter test requirements are first reviewed by referencing the relevant civil and military specifications. Excitation systems utilized in flight flutter testing are overviewed by stating the relative advantages and disadvantages of each technique. Flight test procedures followed in a typical flutter flight testing is described for different air speed regimes. Modal estimation methods, both in frequency and time domain, used in flutter prediction are surveyed. Most common flight flutter prediction methods are reviewed. Finally, key considerations for successful flight flutter testing are noted by referencing the related literature.

Online, real time monitoring of flutter stability during flight testing is very crucial, if the flutter character is not known a priori. Techniques such as modal filtering can be used to uncouple response measurements to produce simplified single degree of freedom responses, which could then be analyzed with less sophisticated algorithms that are more able to run in real time. Frequency domain subspace identification methods combined with time‐frequency multiscale wavelet techniques are considered as the most promising modal estimation algorithms to be used in flight flutter testing.

This study gives concise but relevant information on the flight flutter stability verification of aircraft to the practicing engineer. The three important steps used in flight flutter testing; structural excitation, structural response measurement and stability prediction are introduced by presenting different techniques for each of the three important steps. Emphasis has been given to the practical advantages and disadvantages of each technique.

This paper offers a brief practical guide to all key items involved in flight flutter stability verification of aircraft.