The Panama Canal was officially opened on 15 August 1914. At this point, the United States had been the builder of a difficult and controversial project for ten years and was to be the operator of the most important link between the Atlantic and the Pacific. To do this, it first helped Panama to independence, immediately annexing the canal zone. Thus, the construction of the canal is a classic lesson in colonial, (inter-)national politics and its interdependencies in the early twentieth century. At the same time, Panama was a fairly widespread topic of US popular music. This article investigates the effects of politics on cultural life, using the example of popular music referring to Panama. Applying a postcolonial approach, it will study the musical ways in which the United States constructed its pseudo-colony Panama as an Other in order to exercise power there and continue to form its own national identity.

This paper presents a compliant variable admittance adaptive fixed-time sliding mode control (SMC) algorithm for trajectory tracking of robotic manipulators. Specifically, a compliant variable admittance algorithm and an adaptive fixed-time SMC algorithm are combined to construct a double-loop control structure. In the outer loop, the variable admittance algorithm is developed to adjust admittance parameters during a collision to minimize the collision time, which gives the robot compliance property and reduce the rigid collision influence. Then, by employing the Lyapunov theory and the fixed-time stability theory, a new nonsingular sliding mode manifold is proposed and an adaptive fixed-time SMC algorithm is presented in the inner loop. More precisely, this approach enables rapid convergence, enhanced steady-state tracking precision, and a settling time that is independent of system initial states. As a result, the effectiveness and improved performance of the proposed algorithm are demonstrated through extensive simulations and experimental results.

An article published in 2018 by J.D. Hamilton gained significant attention due to its provocative title, “Why you should never use the Hodrick-Prescott filter.” Additionally, an alternative method for detrending, the Hamilton regression filter (HRF), was introduced. His work was frequently interpreted as a proposal to substitute the Hodrick–Prescott (HP) filter with HRF, therefore utilizing and understanding it similarly as HP detrending. This research disputes this perspective, particularly in relation to quarterly business cycle data on aggregate output. Focusing on economic fluctuations in the United States, this study generates a large amount of artificial data that follow a known pattern and include both a trend and cyclical component. The objective is to assess the effectiveness of a certain detrending approach in accurately identifying the real decomposition of the data. In addition to the standard HP smoothing parameter of $\lambda = 1600$, the study also examines values of $\lambda ^{\star }$ from earlier research that are seven to twelve times greater. Based on three unique statistical measures of the discrepancy between the estimated and real trends, it is evident that both versions of HP significantly surpass those of HRF. Additionally, HP with $\lambda ^{\star }$ consistently outperforms HP-1600.

The production and distribution of ceramic building materials (CBM) in the Roman period have long attracted the attention of archaeologists, as they provide clues to aspects of trade, identity, and technological and architectural traditions. However, there has been a notable scarcity of studies focusing on plain CBM in the southern Levant, particularly in the Mediterranean coastal region. This study concentrates on CBM (bricks, tubuli, drainage pipes, and roof tiles) from a Roman-period wealthy farmstead (Khirbat Khaur el-Bak) near the city of Ashqelon/Ascalon, apparently owned by a serving member of the military or a veteran. The petrographic analyses indicate that apart from the locally produced drainage pipes, the CBM were imported from overseas, namely Cilicia and Beirut. The results shed light on CBM trade in the Eastern Mediterranean, and on the complex nature of the population and material life in and around Roman Ashqelon, which included local and foreign elements.

Much of West Africa (and particularly the Sahel) may be once falling again under military government. This essay asks what, if anything, historians of Africa can contribute to an understanding of this phenomenon. I argue that writing the history and understanding the memory of military government will entail a renewed approach to political history and social theory. It will also entail confronting — just as so many citizens are currently doing — the peculiar failures of democracy in Africa's neoliberal era.

We construct a collection of families of higher Chow cycles of type $(2,1)$ on a two-dimensional family of Kummer surfaces, and prove that for a very general member, they generate a subgroup of rank $\ge 18$ in the indecomposable part of the higher Chow group. Construction of the cycles uses a finite group action on the family, and the proof of their linear independence uses Picard–Fuchs differential operators.

The activities of eighteenth- and nineteenth-century music collectors help to chart the development of the period’s canon and understand the connections between consumers as amateur musicians and collectors and the composers and their music. In 2014, a collection of music came to light at the ancestral seat of the Earls of Bradford, Weston Park in Shropshire, which reveals a scenario of amateur music-making intrinsically linked to the wider professional scene. This collection has been largely ignored due to its unbound state in a private residence. It is of importance for its association with the five generations of the Bridgeman family, and for numerous manuscripts of previously unknown cello works; but crucially, the presence of four manuscript catalogues, a teacher’s bill for music, and an auction sale catalogue dating from the time, helps to fill in the gaps of what was being performed in the house, by whom, where, and when. This article describes seven sources connected with family music-making and presents a catalogue of the current music collection at Weston Park as supplementary material in the form of a data set in an Excel spreadsheet. Readers can consult the collection as it stands today and how it developed over 150 years.

Although some organizations encourage employees to generate radical ideas by implementing stretch goals, the relationship between stretch goals and radical creativity is complicated. Unfortunately, existing research has not adequately addressed this issue. Therefore, we integrate signaling theory with creativity-related research and propose that the interaction between stretch goals and cognitive flexibility predicts employees' willingness to take risks, thereby influencing their engagement in radical creative activities and ultimately affecting their radical creativity. To test our hypotheses, we conduct two empirical studies. The results suggest that, for employees with high cognitive flexibility, stretch goals increase their willingness to assume risks, thus leading to improved engagement in radical creative activities and enhancing their radical creativity. Conversely, for employees with low cognitive flexibility, stretch goals decrease their willingness to take risks, which hampers their engagement in radical creative activities and their radical creativity. The theoretical contributions and practical implications of this study are also discussed.

In his 1984 AMS Memoir, Andrews introduced the family of functions $c\phi_k(n)$, the number of k-coloured generalized Frobenius partitions of n. In 2019, Chan, Wang and Yang systematically studied the arithmetic properties of $\textrm{C}\Phi_k(q)$ for $2\leq k\leq17$ by utilizing the theory of modular forms, where $\textrm{C}\Phi_k(q)$ denotes the generating function of $c\phi_k(n)$. In this paper, we first establish another expression of $\textrm{C}\Phi_{12}(q)$ with integer coefficients, then prove some congruences modulo small powers of 3 for $c\phi_{12}(n)$ by using some parameterized identities of theta functions due to A. Alaca, S. Alaca and Williams. Finally, we conjecture three families of congruences modulo powers of 3 satisfied by $c\phi_{12}(n)$.

This article focuses on the ancestral human remains of Indigenous peoples that were taken by European invaders during the colonial era. It begins by considering the notion of human remains. It then describes the two types of heritage that result from the removal of human remains: the tangible heritage made of the remains exhibited or stored in the museums or universities of former colonial States, and the intangible heritage made of the collective memories of the surviving communities and their descendants about the removal (and the absence) of the stolen remains. The article next examines the role of national and international laws with respect to the restitution of human remains by exploring the concept of transitional justice. This article argues that transitional justice can facilitate the meaningful repatriation of ancestral human remains and hence the healing of past injustice.